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Categories
- Living beings
- Transportation
- Space
- Vegetation
- Science
- Planet Earth
- Technology
- World
- Business/economics
- Sports
Living beings
- Is hummingbird the smallest bird? How small is it?
- Can any animal live for years without food?
- Why do we speak louder than normal when wearing headphones?
- Why can't we see in the dark like cats and owls?
- How was blood circulation proved by William Harvey?
- Can insects like fly hear?
- How do honeybees help plants?
- Which is the heaviest organ in human body?
- What causes some people to faint all of a sudden?
- Why does laughter bring tears to the eyes?
- Is there any bird which is poisonous?
- Why does a honey bee die after it stings a human being or an animal?
- Why can’t we remember what happened to us when we were babies?
- How many flowers a honeybee must visit to make 1 kilogram of honey?
- Where did New Zealand’s birds and animal like kiwi, kea, kakapo, possums, sheep, etc come from?
- How does bat manage to fly in the dark night?
- What is the world’s largest vulture? And where is it seen?
- Why does a cat dropped from a height always land on its feet?
- Can a housefly see in all the directions at a time?
- How many red cells are there in human blood? How are they counted?
- Why do the snakes living in deserts move sideways?
- Some camels have two humps on their back. What are they called?
- Why do cat's eyes shine in the darkness of night?
- Why some birds like Ostrich, Kiwi and Penguins are flightless?
- Which are the longest sleeping animals, after sloth?
- Why and how do spiders spin threads?
- Do parrots know what they are talking about?
- Why deer have antlers? What are they made of?
- What is tetanus? What causes it?
- Why does sore throat look red?
- How does cockroach easily avoid a swipe? Which organ forewarns it about the attack?
- Why do we swing our arms back and forth while walking?
- Why our height increases a little during night's sleep?
- Is there a color that human eyes can not see?
- Why do dogs sometimes breathe with their mouth open and tongue lolling out?
- Why do we lose the sense of smell when we have a cold?
- What is the function of the outer ear or pinna?
- Why can’t we remember certain dreams?
- Do our brains work while we are asleep?
- Do bees really hum as they fly? If yes then why?
- Where do seashells come from?
- Which is the largest insect in the world and where is it found?
- Which bird lays the largest egg?
- Why were prehistoric dinosaurs so gigantic? What was the advantage of their large size?
- Why does the tongue burn after eating chili? What is the quick remedy for it?
- How long can a whale stay under water?
- How does a snake swallow something bigger than itself?
- What does a virus look like? How does it function?
- What causes an intensely painful and persistent toothache? And what is the remedy?
- Which is the fastest moving land snake in the world?
- Why does mosquito bite itch? How to prevent mosquitoes from biting?
- How can some insects like housefly walk upside down on the ceiling?
- What is sponge? Is it an animal or a plant?
- Why does one’s face turn pale white when one is frightened?
- Why do we have lines on the palms of our hands?
- How do insects infect us through their sting or bite?
- How the human body makes blood?
- Why do we feel thirsty after consuming salt?
- How much oxygen a person consumes in a minute?
- Which is the most venomous (poisonous) snake in the world?
- Why birds perched on high voltage electric wires don’t get electrocuted?
- How big is the largest dinosaur egg found so far?
- Which is the most dangerous creature in the world?
- Why hair color becomes white as we get older?
- What is the reason for somnambulism (sleepwalking)?
- Why does a rooster crow loudly at daybreak?
- Why birds don’t fall down from a tree branch during sleep?
- How do police dogs sniff out hidden explosives?
- How do camels store water in their hump? And how long can it survive without water?
- Why ice-cream sometimes causes a headache?
- Why does a dog go round and round before it lies down?
- Do white elephants really exist? Where can they be found?
- Why do ants touch each other with their heads when they meet? Why do they walk in a file one behind another?
- How does a chameleon change color to blend with its surroundings as a protective measure?
- Why do we feel dizzy after running in circles?
- Is overdose of vitamins harmful or the body just flushes out the excess substance?
- Why do we rub our eyes when we are tired?
- What causes hiccups and how they can be cured?
- Why do we have two – deciduous and permanent – sets of teeth?
- Is it true that drinking a glass of warm milk before going to bed induces sleep?
- Why do eyes burn when cutting onions? How to prevent it?
- What is the reason for acidity and burning sensation in the chest after eating spicy food?
- What is the scientific cause of headache and migraine? What actually happens in the head at that time?
- Why does tail of a house-lizard (gecko) jerk and toss about for some time even after detaching from the body?
- What's the reason for and benefits of fever and body temperature rise?
- Is Chihuahua the smallest breed of dog?
- Why the flock of migrating birds mostly flies in ‘V’ formation only?
- Why do we yawn? Is it infectious? And why do the ears appear to have become deaf during a yawn?
- Do Hippopotamuses have pink colored sweat? What is the reason for it?
- How does a sloth survive in the wild where norm is survival of the fittest?
- What is the difference between tortoise and turtle?
- Why do we have wisdom teeth? Why are they sometimes painful?
- Why do snakes have forked tongue?
- What are fingernails made of? Why do they appear pink?
- Do fish drink water? What is Osmosis and Diffusion?
- If you can see something with one eye closed then when seen with both eyes why doesn’t it appear double?
- How did Swine Influenza Virus (SIV) originate? And how did it get the name H1N1?
- Why does persistent yelling make one hoarse?
Transportation
- Which is the longest non-stop flight ever made by a commercial airliner?
- What happens if an aircraft flying in stormy weather is struck by lighting?
- How much petrol the fuel tank of an airplane carries?
- Why in traffic signals red light is always placed on the top but in railway signals it is placed below green light?
- Which is the world’s most successful passenger aircraft so far?
- Why the entire surface of the passenger planes is not painted over? Why the nose of the plane is black?
- What are the features of the world’s cheapest car, Tata Nano?
Space
- What is the source of the Sun's energy output?
- What kind of atmosphere does Mars have?
- Why do stars have different colors?
- What did the American astronauts leave behind on the Moon?
- How will the Universe end? Or will it go on expanding forever?
- Is there a supermassive black hole at the center of our Milky Way galaxy?
- Why has Pluto been demoted being classified as dwarf planet?
- What happens when two galaxies collide in the universe?
- What is a Quasar?
- What is antimatter? Are there stars and planets made of antimatter?
- Which has been the longest manned spaceflight so far? How long can astronauts stay in weightlessness?
- How will our universe end? Have astronomers made any prediction about its ultimate fate?
- How many stars are there in Our Galaxy – The Milky Way?
- How do astronomers detect black holes if they cannot be observed with any kind of instrument?
- Is there any possibility of undertaking the first manned space flight to Mars, the red planet?
- What did Galileo Galilei see when he turned the first telescope to the Sun?
- Could Jupiter ever become a star? If it did, how would it affect the solar system?
- Why is the Moon sometimes visible during the day?
- What kind of a star is called White Dwarf?
- What is a shooting star? Do stars really fall down from the sky?
- When our Sun becomes a black hole, would it gobble up the Earth?
- Why there are more stars in the sky some nights than the others?
- Why is it not possible to see a black hole?
- When was the existence of black holes predicted for the first time? And by whom?
- How did our Milky Way Galaxy originate? What led to the formation of such a huge entity?
- Will the Earth become a black hole one day?
- What is the difference between a meteor and a comet?
- Why stars flicker whereas planets shine steadily?
- Did Neil Armstrong really go to the Moon or NASA had faked the Moon landings?
- What temperature is faced by astronauts and satellites in the space?
- What is the exact number of stars? What method is used by the astronomers to count them?
- What do black holes in the universe look like?
- Why are astronauts weightless in the space? Is it because they are beyond the pull of gravity?
- Do other planets experience total solar eclipse like the one we witnessed on July 22, 2009?
- How does the Sun convert its mass into energy according to Einstein’s famous equation E=mc²?
- Which is the highest mountain in the Solar System? Is it Mount Everest?
- Which force keeps satellites circling Earth?
- What is the length of day and night on the moon?
- Where had the Big Bang happened? Where is the center of the universe?
Vegetation
- What is the raw material of menthol?
- What is miracle fruit that turns sour food sweet?
- How can a Peepal tree grow on a bare wall which apparently lacks nutrients?
- How does groundwater reach up to the top of the tall trees like coconut palm?
- Why don’t trees suffocate during autumn for they carry out respiration through leaves?
- Are there any plants without flowers, fruits, seeds or even roots?
- Where does the flavoring agent vanilla come from? Is it sourced from plants?
- Which is the least nutritious fruit?
- Which tree gives the lightest wood in the world? And which one is made of the heaviest?
- Which is the most nutritious fruit among those commonly eaten raw?
- Why different flowers have different colors?
- When, how, and where was the world's first coffee discovered?
- What are the different types of carnivorous plants?
- Why are some plants insectivorous, or carnivorous?
- Why do trees stop growing after reaching a certain height?
- Which are the tallest plants and trees in the world?
- Why does sunflower always face towards the Sun?
- Why the skin of a banana turns black in refrigerator?
- What substance is the white powdery coating on grapes?
Science
- Why are dark things warmer than light colored or simply white things?
- How are bombs made out of chemical fertilizers?
- How do botanists know the exact age of a tree?
- Why do we see the flash from a gun before we hear noise?
- What are Polarized sunglasses? How do they work?
- How do sound waves travel through air? Why do they move faster in water than in air?
- Why an automobile's windscreen glass shatters into rounded pieces when it breaks?
- Why the capacity of air conditioners is expressed in tons instead of horsepowers?
- Why a multistage rocket is needed to get a spacecraft off the Earth and into the space?
- How does a combination lock work? Why is it considered more secure than the cylinder lock?
- Can hydrogen become an alternative fuel to petrol and diesel?
- Why is gold so easily malleable while iron is so rigid?
- How much helium is required for buoyancy if a person wants to go up in the air on a balloon?
- On milling maize (corn) we get maize flour then how is corn oil derived?
- If one walks inside a train in the same direction the train is moving, does one move faster than the train?
- What is the process of food irradiation? And how does it prevent food spoilage?
- What is pig iron? How did it get this name?
- What is bionic technology or bionics?
- Whose idea was it to produce electricity from nuclear energy?
- Why sand is attracted to magnet even though it is not a metal?
- What is anemometer? How does it work?
- How many electrons are there in electric current?
- How much CO2 does a passenger car emit per kilometer traveled?
- At what speed light travels? How do scientists measure the exact speed?
- Why is the cooling power of air-conditioner measured in tons?
- What creates ripples like undulating patterns of sand in the desert?
- Why do we hear the sound of sea waves a conch shell?
- What is time dilation? Is it possible for an astronaut to travel 2,000 light years in a lifetime?
- How do neon and fluorescent lights work?
- What is Centrifugal Force? Is it of any use to us?
- Why when the train races forward its smoke goes backwards?
- What function does barcode perform? And where is it used?
- Is telepathy fact or fallacy? Can thoughts really be transferred through extrasensory means?
- How is cold generated in a refrigerator? Why is icebox positioned on top in a fridge?
- How does soft water differ from hard water?
- Why are the windows in airplane passenger cabins oval?
- Does every planet have a law of gravitation?
- Does light get fainter as it travels?
- How does glue work? How does it bond two things?
- Is there any specific difference between mass and weight?
- Why does blotting paper absorb ink?
- Why do factories have tall chimneys?
- How does soap take the dirt out of things?
- Why do dark objects look smaller than bright objects?
- Why does milk turn sour? What gives it sour taste?
- Why is foam of soap always white even if the soap is of different color?
- Why does a candle flame defy gravity and burn upward? What will happen on lighting a candle in space?
- How fast does a free falling object fall?
- Why does hot water freeze faster than cold water?
- How does meteorological department study the higher atmosphere for making weather forecast?
- What is the secret behind strength and durability of the Great Pyramid of Khufu?
- Why some diseases are infectious while others are not?
- Why does yeast make bread rise and bubble?
- How does India-rubber and ink-eraser erase pencil and ink marks?
- Do things weigh heavier or lighter when hot or cold?
- Why walking on ice is difficult? Why is ice slippery?
- What is chloroform? Why does it send the person to sleep?
- Why does heat make paper curl up?
- How is Einstein's theory of relativity responsible for the color of gold?
- Why does iron sink in water but floats on mercury?
- What does the word ‘Cola’ mean in Coca-Cola and Pepsi-Cola etc.?
- Why does water gurgle when it's flowing out from a bottle?
- How does blood pressure measuring apparatus (sphygmomanometer) work?
- How can doctors tell our temperature by feeling our pulse?
- Why does water always seem shallower than it is?
- Which is the softest mineral that has been given the lowest rating of 1 on Mohs scale of mineral hardness?
- Why do Formula One racing cars make so much noise?
- What is the size of an atom? Can we see it?
- How does the pain killer Aspirin work inside the body?
- Does sound travel at the same speed in air and water? Does it go on forever?
- Why is it easier to swim in saltwater than in fresh?
- Why vaccination prevents us from having smallpox?
- Who invented stethoscope? How does it work?
- How to find right direction without a compass?
- How is colorfully striped toothpaste manufactured?
- Why hot water appears milky white when drawn from the faucet?
- What are sound waves made of?
- Why does a popcorn kernel “pop” when it is roasted?
- Why photochromic glasses turn dark when exposed to sunlight?
- What is the unit of carat which is used for measuring the weight of diamonds?
- What’s the reason for keeping a hole in the center of a parachute?
- How is ‘expiry date’ of medicines determined?
- What shape do raindrops have? Are they tear-shaped like normal droplets of water?
- Does iron increase in weight when it rusts?
- What technique is used in microwave ovens to cook food in minutes?
- What is thermocol? And what is its manufacturing precess?
- Why are X-rays named after a letter of alphabet? What makes the X-rays pass through solid objects?
- Are bullets fired into the air lethal?
- Why is steam hotter than the boiling water?
- Why sugar dissolves faster in hot water than in cold water?
- Why does food cook quicker in a pressure cooker?
- Why is water used as a fire extinguisher?
- What are the units of measurement of light?
- What is the process of turning Mercury into Gold?
- Which material is used for making capsules of medicine?
- When was the mathematical symbol π (pi) discovered? And what are its peculiarities?
- How do bakers make a small lump of dough swell up and turn it into spongy bread?
- Why does a boomerang return to its thrower? What's the science behind it?
- Why ships and airplanes measure speed in nautical miles (knots) rather than miles and kilometers?
Planet Earth
- What is a hurricane? How is it different from a typhoon?
- Which is the remotest inhabited island? How far is it from the nearest human habitation?
- How many oceans are there on the Earth?
- How high up do the highest clouds float?
- What is pumice stone?
- Like the Moon, does the Sun play any role in causing ocean tides?
- What caused the earthquake and the tsunami in Japan on March 11, 2011?
- Where is the next tsunami expected to strike? Western USA!
- Which direction the needle of a compass will point to if the compass is on the North Pole?
- How did South Africa come to be so well endowed with minerals?
- How much does the Earth’s atmosphere weigh and what amount of pressure does it exert on our body?
- Is there more moonlight in winter than summer?
- Why is there a runaway greenhouse effect on planet Venus?
- Why Yellow Sea, Black Sea and Red Sea have been assigned such peculiar names?
- What are the chances of a person getting killed by meteorite strike?
- It is true that millions of years ago there was an ocean in the area now occupied by the Himalayan mountain range?
- Which are the biggest waterfalls in the world, apart from Niagara Falls?
- Why the salt in Dead Sea keeps increasing even though it continuously keeps adding fresh water from the river?
- What is the peculiarity of the natural wonder Angel Falls?
- Who was the first to estimate the weight of the Earth?
- How much is the Earth flattened at the Poles?
- Is Maldives going to submerge in the ocean due to rising sea-levels? How much time it has?
- Should we see the Earth go round if we stood still in a balloon in the sky?
- What is responsible for the extinction of dinosaurs, asteroid impact or volcanic eruptions?
- What is smoke made of?
- Which acids are contained in the acid rain?
- What is the Earth made of? What is beneath the Earth?
- Why is the sky dull when a storm is coming on?
- Why does a river curve and twist instead of running straight?
- How was it proven that the Earth is round and not flat?
- Why is rainbow shaped semi-circle? What is the reason for it being colorful?
- What is the weight of the planet Earth? Is it constant or increasing?
- Why does a person weigh different at different places on our planet?
- Why the composition of atmosphere is so specific and steady with 21% oxygen and 78% nitrogen?
- Why aren’t people at the equator thrown off into space by centrifugal force since the Earth is rotating at a high speed?
- Why do clouds float in the sky even though they have tons of water in them?
- What is the quantity of gold in the seawater? Is it possible to reap it?
- Is there any physical evidence that asteroids struck our planet in the past?
- What is the number of active volcanoes in the world?
- To what extent the sea level would rise if all he icecaps in the world melt due to Greenhouse Effect and the global warming?
- Out of the 24, which time zone applies to Antarctica where all time zones meet?
Technology
- Why is a problem in a computer program called a bug?
- Where does a text SMS go if the receiver's phone is switched-off?
- How millions of transistors switch on and off to register the digital 1 and 0 in the microchip?
- Which was the world's first communication satellite?
- What happens if a car having petrol engine is refueled with diesel?
- Who invented the first personal computer and when?
- How does an ejection seat work in a fighter aircraft?
- Who owns the Internet? Is it the US Government?
- Where is all the information data on the Internet stored?
- How long did the first light bulb stay lit?
- Who invented Intel’s first Pentium chip?
- What is RSS feed and RSS aggregator?
- What is email spam? Where is the word 'spam' derived from?
- Who invented the word cyberspace? What does it mean?
- What is the technique of Earthing used in a three-pin electric plug?
- How do machines mimic human speech?
- How does compact disc (CD) work?
- What is meant by a zero watt bulb?
- How does a mobile phone work? And is it harmful for the brain?
World
- Has any of Nostradamus's predictions actually come true?
- Which is the port and which the starboard side of ship?
- Which countries have been under foreign rule for more than a century?
- How many words are in the English language?
- Which has been the longest and heaviest freight train on record?
- Who invented torpedo and how does it work as an anti-ship and anti-submarine weapon?
- Why ten basic numerals are called Arabic numerals even though their script is not Arabic?
- Will the world really end on December 12, 2012? Or it is just a hoax?
- When were elephants first used in war and how far were they effective?
- When and where were playing cards invented?
- When was the ship's distress signal SOS/Save Our Souls used for the first time?
- What is the D-day and what does it mean?
- Who had burned down the original White House building in 1814? And why?
- Which country is the world's largest producer of bananas?
- What was the first logo of the camera brand Canon? Why it failed?
- How were the early mechanical clocks?
- How much is an Oscar Award statuette worth?
- Who invented seismograph for detection of earthquake and measurement of its intensity?
- Who invented the World Wide Web? When was it?
- When was computer giant Microsoft Corporation established?
- Which was the most damaging earthquake in recent history?
- Who invented the Pneumatic tire?
- Why is number 13 considered unlucky?
- How did Greenwich become the center of the world time?
- How many times did Christopher Columbus visit North America?
- Which was the world’s first newspaper? When did it begin?
- Why do some countries drive vehicles on the left-hand side of the road while others on right-hand side?
- Which country was the first to start selling bottled mineral water?
- Who was Uncle Sam? Why the United States of America is called that?
- Does the abominable snowman (Yeti) really exist in the Himalayas?
- Why Mediterranean Sea is named so?
- How many workers were employed for construction of the Great Pyramid of Khufu?
- How many patents are granted for perpetual motion machine so far?
- Which is the most expensive coffee in the world?
- Who brought the idea of a leap year in our calendar, and why?
- Which is the world’s largest construction in terms of ground area?
- Who is the inventor of sellotape? (Richard G. Drew)
- Is it true that Egyptians made the first perfect calendar?
- Why dates and years are different in different calendars?
- Which is the world’s fastest railway train?
- Which is the longest lasting light bulb?
- Who is the actual inventor of electric light bulb, if not Thomas Edison?
- Why did Hitler choose swastika symbol as the emblem in the Nazi flag?
- Which is the largest diamond ever known? Who owns it now?
- Did any of the US presidents own slaves?
- Which is the world’s oldest city still inhabited as in the past?
- Which country was the first to use paper money as medium of exchange?
- What is the origin of the frequently used expression OK (Okay)?
- What is the origin and history of the dollar sign?
- What does the inside of Eskimos' igloo look like?
- Why is the pointing device used for computers called mouse? And who invented it?
- Why is a road linking two cities called highway?
- Which country’s people have the highest IQ (Intelligence Quotient) level in the world?
- Which country has issued the costliest postage stamp?
- Is the Great Pyramid of Giza only Wonder of the World in its original form today?
- Who is the inventor of modern type mobile phone? (Martin Cooper)
- Who created a worldwide craze for motorcycles? From which country it started?
- Why are races run in anticlockwise direction in athletic tournaments?
- When was the Great Wall of China constructed? And what is its exact length?
- Who made Compact Disk first, Phillips or Sony?
- Is László Bíró the inventor of ballpoint pen? And what gave him the idea of making such a pen?
- What does the ‘Rx’ sign on doctors’ prescription mean?
- Who is the Inventor of ‘smiley’ symbol and what is the story of its creation?
- Who was the first to reach the summit of Mount Everest? Tenzing Norgay or Edmund Hillary?
- What's the origin of the words post-box, postage, post office and postman?
- What is the Doomsday Clock? And what is the current time shown by it?
- Who is the inventor of a compass? Is it true that a compass never shows North and South accurately?
- Which country issued the world’s first adhesive postage stamp? And what was it called?
- What is the reason behind different skin colors in people across the world?
- Which are the ten smallest countries in the world measured in terms of area?
- Which country has the oldest army still in active service?
- Why are two sides of a coin called head and tail? Where are its roots?
- Why is British national flag called the Union Jack?
- What is the story of the New York getting its name?
Business/economics
- Which is the highest denominated US dollar note?
- Why doesn’t the government simply print more currency notes when a country is short of money?
Sports
