Do You Know

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What is Global warming? How do we safe guard ourselves and what are the best preventive measures.

Why Magnetic campas show only North and south?

Why Ocean doesn't overflow?

Why Sound doesn't travel in Vacuum and space?

why do you need fuse in your home electric wiring system?

How big the viruses are ?

Why Petrol makes us feel cool when you touch it?

Why Iron catches rust?

How does a telescope work?

Why Astronauts uses a special dress while they go in to space?

why some plugs have three pins in our electric system, what is the purpose of the third pin which is bigger than the other two?

Why sea water is salty?

Why do fell sleepy while you are reading?

Does air has got weight? if yes how do you prove it and try giving some best examples where you can really make use of it.

what are the merits and demerits of ultra Violet rays.

why it is not suggested to sleep underneath trees during nights times especially?

Why wool clothes will keeps you more warmer.?

Why water in a pot are cold in summer.? what is the logic behind?

Why Red colour is used to stop the trains,vehicles at signal points.?

Why do you need Ozone layer.?

What is electric shock and how to avoid it and safeguard.?

what is the purpose of Helmet.?

How danger is the more usage of cell phone.?

How electricity passes from one place to other.?

Why petrol doesn't works in your diesel car.? or vice verse.?

what are cu secs in measuring river waters.? usually we hear it in news during flood times that they say so many cu secs of water released etc.

what is caret in gold.?

Why cooked food gets spoil if you keep at normal room temp i.e out of refrigerator.?

How ATM knows what is your balance in your bank account?

How does a battery work.?

why stepping down is more easy than stepping up in our apartments staircase.?

How do a pilot know where is his destination.?

why food gets cocked faster in pressure cooker.?

How do a electrical cooker knows that the rice is now cooked and it stops the power the main heater, so as to save power and food.?

why do you need Rail transport system though you have road transport system.?

why water taste changes from place to place?

What is in water?

Why clouds are white in colour?

Why do you close while you sneez?

How do you measure the mass of stars?

Why glass is transparent?

What way garlic helps to us?

On what subject Mr Venkatraman Ramakrishnan got Nobel?

Which vitamin does what for us?

What is difference between gravitational force to Magnetic Fource.?

Who is Alek jefreen?

Can animals count nubers or objects?

Why diamonds are so strong?

Can we get vitamin D from the sunrays those are reflecting through our windows?
How are fish able to smell things?
What is Blood Transfusion?
What is a conductor?
What makes the rate of Heartbeat change?
How does a robot work?
What is the rubber?
Why arenít deep sea animals squashed by the water above?
Where do waves come from?
What is etymology?
Why does corn have silk?
What is wood-block printing?
Which sports car is still hand-made?
What is chemical analysis?
What's the World Wide Web?
What are the 'bends'?
What is a leaf spring?
What are paints and dyes?
What is light?
What is voltage?
Why plants produce fruits?
What is a computer program?
What is word processor?
What is cellular telephone?
What was the first jet airliner?
What are mountains made of?
What are the Breathing Organs of man?
What is telecommunication?
What do you know about nuclear waste?
Which factors affect sea life?
What is the secret of a Fire fly's light?
Which train was pulled by horses?
Which plane is invisible?
What is information technology?
How does Light travel?
What is bird migration?
Who designed the steam engines?
Which space travelers had ejector seats?
What would happen if you plant a water plant on land?
How fast does our blood flow?
Are computers intelligent?
What is a dry battery?
What is the structure of the tongue?
What is the smallest living thing?
What is temperature?
Where was rice first grown?
What is classical music?
How soil is formed?
What is saliva?
What is the IQ of the computers?
What gave rise to the mammals?
Who invented Joule?
What is temperature?
What is thermograph?
What bounced around on Mars?
What is energy?
What are stalactites?
What is hemoglobin?
Can you fly without wings?
What is stock car racing?
What is the difference between Fog and Smog?
What are icebergs?
What's the Internet good for?
What is solar power?
What is Polaroid?
Which transatlantic airliner has only two engines?
What are the various sea creatures?
Do you know mosses and ferns?
What is pond ecosystem?
What is vernier caliper?
What are curved mirrors?
Which is the ringed planet?
Why the sun is yellow?
What are the winds and how they are produced?
How do birds build their nests?
Who invented the elevator?
Do all fishes lay eggs?
Will the sun last for ever?
Are Deserts always hot?
How were words made?
What is electron microscope?
How does grass grow?
Why do golf balls have holes?
Who was the first Astronaut?
What does the nervous system consist of?
Why did diesel take over from steam?
Can plants eat insects?
Why do cats have whiskers?
Why is there lead in Petrol?
Do computers find uses everywhere?
Why do some plants produce flowers?
How long can desert animal go without drinking?
What is the snow line?
Where does oil come from?
Which country went electric first?
What is sand made of?
How can we connect computers through telephone lines?
Why is gold expensive?
How does work microwave radio relay system?
How does ether work?
When did we first find out about Dinosaurs?
How does the heart work?
Who created a beam of electrons in Crooke's tube?
Why do alcoholic beverages make you drunk?
Why does nylon crackle in the dark?
When are volcanoes most dangerous?
Why do animals change their shape?
What do you know about ice-hockey?
Why do we use levers?
Why a Whale isnít considered a fish?
What is Alcohol?
Why don't all nations have common money?
Are Jellyfish really fishes?
What is the ozone layer?
Why do birds sing?
Why do things fall?
Where do ice bergs come from?
How does a hair drier work?
Why do rockets have stages?
Who invented arithmetic?
How does a recorder make music?
What was the first Musical Instrument?
Why do Zebras have stripes?
How did man land on the moon?
Why do gardeners use greenhouses?
What is humor?
Which planet is all deserts?
Why was the metric system invented?
Which car could really fly?
Can time stand still?
What do you know about oscilloscope?
Why are the rivers in different colors?
Why wear light colored clothes?
Why do words have certain meanings?
Where do we get wax?
Who made the first Printing Press?
Why does one broken bulb make all the Christmas tree lights go out?
How far away are the stars?
How long do animals take to grow up?
Why did dinosarous die out?
What is irrigation?
Which train is fastest?
Can a butterfly smell?
Why some plants grow on other plants ?
How are chemicals made ?
What are minerals ?
Why do we have mosquitoes?
What causes the tides ?
What gives food its taste?
How does a siphon/tap work?
Can animals communicate?
How does the sun get its energy ?
How do we get oxygen?
What are astroids?
What is a cloud?
Who proved that germs cause disease ?
Why do you get out of breath?
Will we ever visit other solar systems?
Where does electricity come from?
Why is the sea water salty?
Who were the first people to fly across the Atlantic?
Who discovered Mount Everest?
What is video tape?
What is the Pituitary gland?
Why does a fair person's skin go brown ?
How fast does Sound travel?
What causes Deafness?
What crash-tests cars?
Why do cars have gears?
What drives electric trains?
Why do people get allergies?
Which planet is called the red planet?
What is pasteurization of food?
How far from Earth are the other planets?
Who invented practical photographic process?
How lizards move?
Who discovered subatomic particles?
How does a lift pump work?
Why do leaves change color in the fall?
How is a river formed?
How is the steam made?
Which trains travel by cables?
What are tiny creatures share your home?
What is hydroelectricity?
How does Flood come?
What makes petrol burn?
How are the hurricanes formed?
What is lighter than air?
How do worms crawl?
What is static electricity?
How long can you stay in space?
How small is a Molecule?
Which cars race in a straight line?
What are endocrine glands?
Who invented diesel engine?
Why are hair different colors?
What is at the poles?
What is nuclear physics?
How is electricity measured?
What is global warming?
What is the process of invention?
Why does boiling water bubble?
What is Water?
What causes electric shocks?
What is a periscope?
When was copper first used?
Who first used the Pole Star in navigation?
How oil paints are used in painting?
Is there a telescope in space?
What do you know about kidneys?
Why are snowflakes all different?
What is the agricultural revolution?
What is modern sterling engine?
Where did the planets come from?
How the liver works?
What vitamins do we need?
How do we remember things?
What is calculator?
Do water plants grow under or on top of water?
How many types of solar eclipses occur?
Who produced the first photograph?
Who discovered atoms?
Where does nitrogen come from?
What makes rainbows in bubbles?
What are the main causes of Earthquake?
How was the moon form?
What are the bits and bytes?
What are the properties of plastic?
Who invented spinning machines?
What makes a rattlesnake poisonous?
How weight, mass and volume are related?
What is life?
How does an electric convector heater work?
What was the first train engine?
What was the Ice Age?
What is a variable resistor?
When did reptiles first appear?
How volcanoes erupt?
Why is elasticity?
Can we prevent the earth quakes?
What happens in a chemical reaction?
What are antibiotics?
What is a molecule?
Will we colonize Mars?
How do animals survive in frozen lakes?
What measures astronauts take to survive in space?
What is a pollutant?
What's a pantograph?
How do migrating animals find their way?
How do stars appear in the sky?
What is carbon dioxide?
What is an Acid?
What were leather belts for?
Are electric engines better than diesel?
What is an auto gyro?
What does a battery do?
Who steers the train?
What is magnet?
How deep is polar ice?
What is the Water Cycle?
What are robots?
What are bacteria?
When was Gas first used?
What are the modern messengers?
What are yeasts?
What carries missiles?
When did women start curling their hair?
What are the principles of Radar?
What is the spectrum?
Which is the giant planet?
What is ecology?
What are the functions of the sweat glands ?
Which is the largest living bird?
What does fluorescent mean?
What is elasticity?
How is a TV picture transmitted?
Which boats can travel the fastest?
What is a mammal?
What's a locomotive?
Which boats use water jets?
When was coffee first brewed?
What is nuclear physics?
What happens in an earthquake?
When telescope was invented?
What are chains used for?
What is magma?
What is the GCA Radar? How does it control Air-traffic?
Who had a holster on Harley?
What is the highest mountain in the world?
What is an earthquake belt?
What do you know about pager?
What is tornado?
What causes draughts?
What causes gout?
What do rockets carry?
Why are the keys on a typewriter arranged that way?
What are seeds? How they are grow and dispersed?
Who invented transistor?
Who invented the first car?
What are flexible films used in photography?
How does an insect walk on water?
How does the nose sense smell?
What is radio astronomy?
What is air?
What is the Moon's surface like?
What is jet engine?
What is the ozone hole?
How many kinds of Sharks are there?
What is microscope?
Why are helicopters used for rescuing people?
What is four-stroke gasoline engine?
What is light meter?
What are mainframe computers?
what is so special about precious metals?
What is the Pineal gland?
What are cosmic rays?
What did Henri Becquerel discover?
What do you know about particle physics ?
What did Nicola Tesla invent ?
What is the Rh factor?
Why do animals fight?
How canon was invented?
What is space?
What is an autopsy?
Why was oil used as fuel?
Which is the biggest plane?
What are the reservoirs made for?
Which planets have moons?
What is a gyroscope?
Who discovered cathode ray tube?
Was the Soil once Rock?
What is olive oil?
How is whiskey made?
What is carbon monoxide?
What is desktop publishing (DTP)?
What are modern fishing technologies?
How many types of bridges?
Why is lava hot?
What is hazardous waste?
What is lightning?
Why do we have two sets of teeth?
Why do some things float and others sink?
Where does rain come from?
How icebergs move?
What is light interference?
What are minicomputers?
Where do bacteria live?
Where did sugar originate?
What is a Tornado?
What is Hurricane?
How insects bite?
When were cows first used for milk?
What do you know about the nervous system of locomotives?
What do you know about meteorology?
What is a drive shaft?
What happens to frogs in winter?
Can concrete float?
How do plants feed?
What is equilibrium?
How does a banyan tree grow so big?
What is an MMU?
What is evaporation?
How are insects harmful to man?
Which Insects has the longest life?
What is Tropical Cyclone?
What are the characteristics of different reptiles?
What's the recipe for chips?
How was petroleum formed in the earth?
Where do grass seeds come from?
What are space stations installed for?
What is transmission in automobile?
What do you know about the nervous system of man?
What makes rainbows in drops of water?
What makes the Weather?
What are nerve cells?
What are metamorphic rocks?
Where do Penguins' lay their eggs?
How did man learn to write?
What is Dust?
What is Gypsum?
What was the first jet plane?
How insects sting?
How is wine made?
Who discovered radioactivity?
Who invented Archimedean screw?
Who first made the motion picture?
What causes an eclipse?
What makes the sun shine?
What is hydraulic system?
How is synthetic rubber made?
What is orchestra?
How do frog eggs hatch?
What is cathode ray tube?
How our body does maintain its temperature?
What is ozone?
What in the Soil makes plants grow?
Which is the heaviest common metal?
What is weightlessness?
How do we swallow?
Who invented the cotton gin?
Which is the fastest animal?
Where do we get pearls from?
How were the Great Lakes formed?
Do polar bears hibernate?
What are the different uses of sound?
What is brain and how does it work?
What is central process unit chip?
What does 'solid state' mean ?
What is an insulator?
Can Cellulose be produced in the laboratory?
What is the main component of natural gas?
How were the mountains made?
What is cellular phone?
How does heat insulation work?
What is Bronze Age Civilization?
What are coastal lakes?
Do living things help one other?
Can animals be saved by keeping in zoos?
How was coal formed?
In what ways inertia is useful to us?
What are the main sources of air pollution?
What is voltage and resistance?
What is friction?
How do bees sting?
What is coal?
What do a pencil and a diamond have in common?
What is an electric current?
How many kinds of Seaweeds are there?
What is the most endangered animal in the world?
What is sonar?
What is a two-stroke engine?
Which boats skate on ice?
How do we take in Oxygen?
Why does a baby kangaroo stay so long in the pouch?
What is a turboprop engine?
How is water cycle formed?
When did Plants appear on Earth?
What are the coral seas?
What was the first steam boat?
How is acid rain harmful to us?
How do you measure acceleration?
What are non-renewable resources?
What is the Respiratory System?
What are plane mirrors?
What is Platinum?
How does the CD player get the music from the disc?
What is the first animal live on land?
How steam power was discovered?
What is the Internet?
What is the history of computer?
What is acid?
Where are lemurs found?
What are the effects of acid rain?
How do bees spread flower pollen?
What is fermentation?
Which car runs on sunlight?
Who invented Celsius scale?
How does a vacuum flask work?
What causes cement to harden?
What was a steam liner?
What are icebergs?
How do caves form?
Which cars don't need gas?
What is compass?
What does a tug do?
Who is called the mathematical genius?
What is leather?
What do you know by the single called organisms?
How does a caterpillar spin a cocoon?
How is music composed?
What is inside a submarine?
Who designed the first electric lamp?
How do we see things in three dimensions?
What is the inside of the Earth like?
What are the various behavior of animals?
What is a hydrofoil boat?
Where do they get iron to make steel?
How big was the dinosarous?
Why does there seem to be more static electricity on dry days?
What is a vacuum?
When did people start cooking meat?
What doesí radioactive' mean ?
How does double-glazing work?
What is the nervous system ?
What is metabolism?
How did movies start?
What is the anatomy or structure of plant?
What do you know about reflexes?
What were analog computers?
What in the soil makes plants grow?
How fast does the earth move?
What is an electrocardiograph?
Are all metals shiny?
What are primary colors?
What are Protozoa?
How camera takes photograph?
How long is the longest train?
What is four-wheel drive?
What are biplanes?
How plants survive in deserts?
What are molecules?
What is music?
What do hornets use to make their nests?
What is Bunsen famous for?
What are digital computers?
What is a Monsoon?
When did men begin to mine for minerals?
When was steam power used?
What is a smart car?
What is Metal?
What are nuclear chain reactions?
What is paraffin?
What is pollution?
What causes sound?
What is volcanic ash?
will the universe comes to an end?
Who discovered how to make electricity?
why do we use pulleys?
Why do things feel cold?
What makes a Wind?
What are the crystals made up of?
Why is the earth a planet?
What is the difference between plants that live on land and plants that live in the water?
What is the importance of olive tree?
Which airliner carries the most people?
What is the main difference between hardware and software components of a computer ?
What is the mainframe computer?
What do you know about crustaceanís animals?
How do stars form?
How are flowers pollinated?
How can you magnetize something?
What is stream evolution?
Which spacecraft is reusable space shuttle do?
Which plane had no wings?
What is drawing?
Were dinosaurs warm-blooded?
What is a two-way mirror?
How heat moves from one place to another?
Can trucks move houses?
How is the periodic table useful to a student or scientists ?
What is a vulture?
What is surface tension?
What is the quantum theory?
What is a photoelectric cell?
What role do the hormones play in our body?
What is a vacuum seal?
Which is the fastest jet?
What is a light year?
How does a color TV work?
Why did Dinosaurs become extinct?
What is amnesia?
What are pesticides and why are they so important?
How does ballpoint pen work?
How clouds are formed?
What is viscosity?
How computers are classified?
What's light entertainment?
How are cars designed?
Who discovered structure of DNA?
Do CDs wear out?
How are bricks made?
What are carnivorous plants?
How can one measure the height of mountains?
How is coal formed?
How did universe begin?
Where do rein deer live?
How do we get nuclear energy?
What is video?
How is body temperature controlled?
Which is the tallest animal on the earth?
Why do astronomers send robot spacecraft in space?
How big are submarines?
What were early steam engines?
Does a cow have four stomachs?
What is Uranium?
How can you tell a tree age?
What is radar used for?
How can flies walk upside down on ceilings?
What is a dam?
How many rocks are found under the earth's crust? How are they formed?
What are bones made of?
How was the first Recording made?
Who invented the jet engine?
What are the 'laws of motioní?
Who discovered an electromagnet?
How do neon lights work?
How did writing develop?
what is the earth made of ?
Why do cars/vehicles have gears?
How the time on the Earth is measured?
When were fingerprints first used for identification?
What happens when we get Dizzy?
What is a sloth?
Why put an engine above a front wheels?
How do small streama grow into a big river?
Why do trees have bark?
What makes a seed?
How does a car battery keep going?
What is a bullet train?
How do gears work?
Who founded Red Cross?
Which trucks can reach high up?
How do we see the different colors through our eyes ?
Is all rice white?
What was alchemy?
How does a microscope magnify?
Which truck tows aircraft?
How far can a fire truck's ladder reach?
What are Fungi?
Who discovered radium?
How do animals fly?
Why total solar eclipse is a unique phenomenon?
How big is the Moon?
What is potential difference?
What is density?
How did radio develop as a household utility?
Who invented amplifier?
How do truck drivers talk to each other?
What was the first fire brigade?
Why does the wind blow?
What is a fulcrum?
Who made the first hang gliders?
Is all Human Blood the same?
How many kinds of trees grow in forests?
How does the computer function?
How did life on the earth begin?
How is humidity measured?
Why are deserts so dry?
Why does iron go rusty?
What is Chlorophyll?
What are supercomputers?
What are different scales of temperature?
What is the classification of various living things?
What are aborigines?
Does sunshine melt metal?
Who drove a vehicle on Mars?
Why does water evaporate?
How do we move and feel?
How do you fit into a space suit?
What makes water rise up narrow tubes?
How does a steam iron work?
How do you go to the bathroom in space?
How does an atomic reactor work?
How can a satellite help in broadcasting?
What is an ocean eco system?
Who flames their cars?
How did the hippopotamus get its name?
What was a safety bicycle?
Does a spoon in a glass of water look bent?
How did the grapefruit get its name?
What is painting and why do you paint?
How do Tigers live in jungle?
Who invented cheap method for making steel?
How does a guitar make music?
What is an electromagnet?
How are colors formed?
Which trucks have dozens of wheels?
What is an oasis?
How do the continents move?
What is a generator?
How do Antibiotics work?
Can snakes hear?
What can see through you?
How can a solid, a liquid and a gas be made of the same kind of material?
What is Ringworm?
How do animals get rabies?
How do we perceive different sensations?
What is a transformer?
How did English Language born?
What is refrigerator?
What is perpetual motion?
How can modern technology be useful in agriculture? Give one example.
How dangerous is a Scorpion?
What is ATM? How does it perform money transactions?
Do dead animals always turn into fossils?
What makes a beautiful sunset?
How do plants survive in the desert?
What is skin made of?
How does an electric motor work?
Why do you change bike /car gear ?
is electronics used in cars ?
Why do we need oxygen?
How were stars formed?
Why are flowers so colorful?
Where does energy come from?
How can a helicopter stop in air?
Where do warts come from?
How do mushrooms grow?
Why lizards sometimes lose their tails?
Why do plants turn toward the sunlight?
What makes a rainbow?
How do scientists know animals are color blind?
How are sand dunes formed?
How did fruits and vegetables get their names?
How do seaweeds survive in the ocean?
How do fish survive in frozen ponds?
How is the ecological balance done?
Why is the center of the earth hot?
How do seeds grow?
Can the scientists make Protoplasm?
Why is it warmer in summer?
How do snakes inject poison?
What are the zones of tropical rainforest?
Why do passengers fall over when a bus starts?
What are thermals?
Why do pine trees stay green all year?
How does a cine projector work?
Where does light come from?
How does waste disposal cause pollution?
What is Ammonia?
How many bones are there in our body?
Who first made bread with yeast?
Do the Houseflies eat solid food?
How do plants grow from cuttings?
What is an oscillator?
Why dams are built?
What were cafe racers?
Why do motorcyclists lean over on corners?
What is internal combustion engine?
How was the petrol engines developed?
Who discovered oxygen?
What is a Cyclone?
Why does it matter if forests are cut down?
How do robots work?
Who first flew faster than sound?
How does a ship sail?
Why can we see only one side of the Moon?
What is a monoplane?
Why do rough things not slide easily?
How do we see things?
What is the difference between Bacteria and virus
How does a CD store music?
How did the cave men make their tools?
How does a fire extinguisher work?
Who discovered comet?
Why species become endangered?
What do lungs look like?
Why do some animals hop and other run?
What are complementary colors?
Can we travel as fast as light?
What is an environmental pollution?
What is refrigerator?
How do jellyfish reproduce?
Why do peacocks have such beautiful tails?
What is Asbestos?
Why is there no life on the other planets?
How do soaps and detergents work?
Could we live on the moon?
What are the sources of water pollution?
What are tropical rainforests?
How can a diamond be cut?
How does a periscope work?
How does the Thermometer work?
How does the brain send messages to the body?
Who discovered the Raman Effect?
How do we see in the dark?
Where do metals come from?
How do animals learn to fly?
How was the earth formed?
How do robots make cars?
What is power?
How do we get solar power?
How do four-stroke gasoline engines work?
What is the Big Bang theory?
why are some gems so rare?
How wind changes the land?
How do satellites stay up?
How does radar work?
What is the eye of a hurricane?
How did infectious diseases begin to be treated?
Why do comets disappear?
Do atoms have subatomic Particles?
Why does a balloon stick to the ceiling after rubbing it on your jumper?
How are some Insects harmful to us?
Why does your temperature rise when you're sick?
What are storage devices?
What are the effects of wind erosion?
Did land plants appear before water plants?
Why do parallel lines appear to meet in the distance?
Can sound travel through water?
Why is the recycling necessary for environment?
How do our eyes work?
Do fishes ever sleep?
Why do sliding things get hot?
How does a porcupine find off its enemies?
What was the contribution of Archimedes?
How can scientists know what the sun is made of?
Why don't oil and water mix?
How can we Balance ourselves on two legs?
Why is there no life on the moon?
Why does the moon have different shapes?
Do the other planets move like the earth?
How do we breathe?
Why does a magnet pick up a string of pins?
How does our body fight diseases?
Who was Marconi?
Why do trees have needles?
Does the male sea horse have babies?
How do scientists determine ocean depths?
How do plants drink?
How does the Weather man forecast?
What is a virus?
Who invented the Typewriter?
How do animals move in water?
How do color filters work?
How do turtles breathe underwater?
How many types of clouds are found in sky?
What is word processing?
Why does thunder follow lightning?
How does the water pollution harm us?
Why do a cat's eyes glow in the dark?
Why is it cooler on top of a mountain?
Why does the sun turn red at sunset?
Do insects have hearts?
How do fish reproduce?
Why does rubber bounce?
What is a stroboscopic picture?
Why is blood red?
How can the distance to a star be measured?
What are septic tanks?
How do animals without legs move on the ground?
Where is a snake's heart?
How does a spin drier dry?
How did double-acting steam engine work?
Why does hitting things make them hot?
Do animals always have two parents?
why does bread go mould?
Why do we get sunburned?
why is the sky blue?
How do lungs work?
Do birds have ears?
Why can't animals talk?
Why is the sea salty?
What does the Liver do?
How do you cut a diamond?
How are Fossils formed?
How do animals survive in desert?
What are the blowouts and dead dunes?
How often do comets come near the earth?
Do insects breathe?
Why is the air colder as one climbs higher?
Why does hot air rise?
Why does frozen water make pipes burst?
Do we keep the same skin all our life?
Why are there mountains and oceans on the Earth?
How astronauts live in space?
How many types of solar eclipses occur?
When will fossil fuels run out?
How do we know what Dinosaurs were like?
Who discovered chemical bond?
What is the special line of Latitude and Longitude?
What is anatomy of the Universe?
How do caves form?
What is condensation?
What is an echo?
What are microcomputers?
why are telephone numbers so long ?
How do dipping ducks keep on moving?
Is the Earth's surface moving?
What is instinct?
How do parrots talk?
Why do we get Pimples?
How does steam power work?
Who discovered the Atom?
why does the sky change color?
What is electrolysis?
How do we know where to find oil?
How to find blood groups?
How far does outer space go?
Which is the largest animal in the world?
How is a TV picture produced?
How does a tape recorder work?
Why haven't they found a cure for cancer?
Why do plants need sunlight?
Which are the smallest moons in the Solar System?
What is thymus and its role in the body?
How does a kaleidoscope work?
What is a diode?
Why does cream float best on coffee with sugar in it?
How do trees grow?
How does fuel system work in automobiles?
Do mirrors invert?
What is a satellite?
Do seeds die when birds eat them?
Do satellites ever fall out of the sky?
What is the fastest mammal?
How is copper obtained?
Where are blue whales found?
Why does a comet have a tail?
Why speed at sea measured in knots?
What is a magnetic force field?
What is an X-ray?
What things are made from oil?
Why embankments are built along rivers?
Why do Fleas live on dogs and cats?
Who was the first to suggest that all matter in made up of atoms?
Why Dolphins are considered intelligent?
Why do some trees lose their leaves?
Why canít we eat grass?
Why is gravity in space not the same as on earth?
Why has global warming generated much interest now a day?
Why do we need an atmosphere?
Who watches from space?
How does the nervous system regulate the functioning of body?
Why do people smoke?
What do sharks eat?
What are salivary glands?
What makes the earth travel around the sun?
What keeps you up on a moving bicycle?
How often do snakes shed their skin?
What is spectroscopy?
How is concrete delivered?
How is a pendulum used to run the time?
How is butter made?
How is distance measured?
How seeds germinate?
How are raisins made from grapes?
How are snowflakes made?
How are synthetic fibers made?
How do cellular telephones work?
How do lungs help in respiration?
How do Clouds stay up in the Sky?
How do migrating animals know when to start?
How do our Kidneys function?
How do owls hunt?
How do spectacles help people to see?
How do the feathers help birds in flight?
How do we digest?
How do we repair the damaged parts of our body?
How does a bicycle dynamo work?
Can birds smell?
Does it seem warmer at the sea by night than in the daytime?
How does a radio work?
How does a simple dynamo work?
How does a telephone work?
How does an oven thermostat work?
How does electricity travel?
How does steam turbine engine work?
How does the Brain help us to see?
How telegraph was invented?
How thermostats work?
How were the time zones decided?
Did any thing fly before the bird?
What are auroras and what causes them?
What are catalysts?
What are conductors and insulators?
What are clouds made of?
Can you store anything besides music on a compact disc?
What are Fingernails made of?
What are dust storms?
What are gases?
What are hurricanes?
What are fuses for?
What are gemstones?
What are muscle fibers?
What are plastics?
What are space stations?
What are laws of reflection?
What are renewable resources?
What are springs and dampers?
What are the constellations?
What are the properties of plastic?
What are Vertebrates?
How does a fridge work?
Who invented barometer?
What causes Dandruff?
What do astronauts eat?
what happens when a meteor hits the earth?
What is a chopper?
What is a detergent?
What is a laser beam?
What is a Polaroid film?
What is a transistor?
What is absolute zero?
What is an element?
What is an organism?
What is astronomy?
What is biotechnology?
What is Chlorine?
What is blood made of?
Why does silver tarnish?
What is communication satellite?
What is computer network?
What is dew?
What is computer graphics?
What is electric current?
What is electricity?
What is Endocrinology?
What is nuclear fission?
What is microbiology?
What makes earthquakes happen?
Which light cuts, heals and measures?
Do other suns have planets?
Who invented radio?
Who started Vaccination?
Who invented steam locomotives?
Why are forests important?
Why do animals hibernate?
Why do birds sing?
Why do bees do a dance?
Why do children get Chicken Pox?
Why do different animals have their eyes positioned in different parts of their heads?
Why do grass land animals live in herds?
why do so many types of animals & birds live in tropical rain forests?
Why do we have eyebrows?
Why do sodium lights sometimes glow red?
Why do we have leap year?
What's the difference between mushrooms and toadstools?
How are photograph made?
Why do we need so much sleep?
Why do woodpeckers peck on trees?
Why does a curved mirror magnify?
Why does it rain more on high ground than on low?
Why does the nose have Mucus?
Why Mars is called the red planet?
What is pneumatic system?
How does a barometer forecast the weather?
What are Birthmarks?
How are calories measured?
How can you tell if a piece of metal is a magnet?
What is the difference between bacteria and viruses?
Why animals live in groups?
Why teapots are made shiny?
How do animals survive the cold?
Why do we have seasons?
How does lunar eclipse occur?
How is electricity generated?
 
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