128 Fun Facts About Trivia Questions for Second Graders

Spiders, scorpions and ticks all belong to which group of animals?

Arachnids such as spiders straighten their legs with fluid pressure instead of muscle, which is why a dead spider's legs curl up.

How many legs does an insect have?

Six legs let most insects walk on tripods: three feet stay planted while the other three swing forward, which keeps them steady.

What is a baby frog called?

Tadpoles hatch from frog eggs with tails and no legs, then grow legs and lungs as they turn into frogs.

What does a caterpillar turn into inside its chrysalis?

A butterfly is built almost from scratch: inside the chrysalis most of the caterpillar's body breaks down, and wings and eyes grow from small groups of cells that survive.

Which is the fastest land animal?

The cheetah's claws never fully pull in like a pet cat's, so they grip the ground like the spikes on running shoes when it sprints.

Which is the tallest animal in the world?

The giraffe's long neck has only seven bones, the same number as a human neck; each one is simply stretched to more than 10 inches long.

What is the biggest animal that has ever lived?

The blue whale, the largest animal known to have lived, feeds almost entirely on krill, tiny shrimp-like animals it strains from huge gulps of sea water.

Which bird cannot fly but is a great swimmer?

A penguin's two-tone coat is camouflage at sea: seen from below, a pale belly blends into the bright surface, hiding the swimmer from seals and orcas.

Which is the only mammal that can truly fly?

Bat wings are really hands: thin skin stretched over the same bones as four human fingers, grown very long, so a bat can flap where flying squirrels only glide.

Where does a mother kangaroo carry her baby, called a joey?

In a pouch, and the joey gets there by itself: born barely an inch long, it crawls up through its mother's fur and climbs in.

How many hearts does an octopus have?

Three hearts pump an octopus's blood, which is blue instead of red because it carries oxygen with copper.

What do giant pandas eat almost all the time?

Bamboo stalks are gripped with a 'false thumb', an enlarged wrist bone that lets a giant panda hold its food while it sits upright and chews.

What is true of a zebra's stripe pattern?

Different on every animal, like human fingerprints, a zebra's stripes let researchers recognise individual zebras in the wild.

What colour is a polar bear's skin under its fur?

Black skin hides under fur that isn't really white: each hair is a clear, hollow tube that only looks white because it scatters the light.

Which of these birds hunts mostly at night?

Owls cannot move their large eyes, so they swivel their whole heads to track prey instead.

A group of lions is called what?

A pride is a family of related lionesses, who usually stay in it for life and do most of the hunting, while young males are driven out once they grow up.

What do bees make honey from?

Bees make honey from nectar from flowers, carried home in a special honey stomach and dried out inside the hive until it thickens.

A dog is a tame descendant of which wild animal?

The wolf that dogs descend from was not today's grey wolf but an ancient kind that has since died out, which makes modern wolves the dog's cousins rather than its parents.

What is a camel's hump full of?

The stored fat gives the camel energy on long desert trips when food is scarce.

What do we call the path a planet follows around the Sun?

An orbit is not perfectly round: Earth's is slightly oval, bringing it about 3 million miles closer to the Sun in January than in July.

The Sun is actually what kind of object?

A star like the ones we see at night, the Sun looks so different only because it is so close; light from the next nearest star takes more than four years to reach us.

Who was the first person to walk on the Moon?

Neil Armstrong appears in only a few photos from the walk: the famous picture of an astronaut on the Moon shows Buzz Aldrin, with Armstrong reflected in his visor.

Which scientist split sunlight into a rainbow with a prism?

Isaac Newton showed that white light is a blend: each hue bends by a slightly different amount in a prism, which is why the beam fans out into a rainbow.

How many minutes are in one hour?

Sixty comes from the ancient Babylonians, who counted in sixties, a handy number because it divides evenly by two, three, four, five and six.

A leap year adds an extra day to which month?

February gains a 29th day about every four years because Earth needs roughly a quarter of a day more than 365 days to go once around the Sun.

Which is the coldest continent on Earth?

Antarctica is the coldest continent, yet it counts as a desert: so little snow falls on its icy interior that it is one of the driest places on Earth.

Which of these seas and oceans is the largest in the world?

The Pacific got its name from explorer Ferdinand Magellan, who called it the 'peaceful sea' because the water was calm when his ships sailed into it in 1520.

Which is the tallest mountain on Earth?

Mount Everest rises about 29,000 feet (8,849 m) on the border of Nepal and China, the highest point on Earth.

Which is the longest river in the world?

The Nile is usually ranked the world's longest river; every year it once flooded and left fresh, rich mud along its banks, letting people farm where almost no rain falls.

Which is the largest hot desert in the world?

The Sahara was green until about 5,000 years ago: grassland and lakes covered it, and ancient rock art there shows hippos and antelope.

Which continent is the largest?

Asia shares one unbroken landmass with Europe; the border between them is only a line people agreed on, running along Russia's Ural Mountains.

About how many bones does a grown-up have?

A grown-up has 206 bones, but a baby is born with dozens more: many start as separate soft pieces that harden and fuse together as the child grows.

A person's heart is about the size of what?

A closed fist is about the size of your heart, and the 'lub-dub' of each beat is the sound of its valves snapping shut.

What is the hard, shiny outer layer that protects your teeth called?

Enamel is very tough, but once it wears away or decays it never grows back, because the body has no way to rebuild it.

A shape with four sides and four right-angle corners is called what?

A rectangle doesn't need two long sides: a square counts as one too, because it also has four sides and four right angles.

What shape is a stop sign in the United States?

A stop sign is an octagon, a shape with eight sides, so drivers recognise it even from behind.

How many squares are on a chessboard?

64 squares star in an old puzzle: put one grain of wheat on the first square and double it on each square after, and the board would need over 18 quintillion grains.

In soccer, which player is allowed to use their hands?

Even the goalkeeper may handle the ball only inside their own penalty area, and not at all when a teammate deliberately kicks it back to them.

How many players from each team are on the field in baseball?

Nine players take the field, but since 2022 every Major League team may add a designated hitter, who bats in place of the pitcher and never fields.

Who was the first president of the United States?

George Washington chose to retire after two terms, and that example held for more than 140 years, until Franklin Roosevelt won a third term in 1940.

Abraham Lincoln was president during which war?

The Civil War was all but over when Lincoln died: Lee's army surrendered on April 9, 1865, and Lincoln was shot just five days later.

Rosa Parks became famous in 1955 for refusing to give up her seat on what?

Her brave choice in Montgomery, Alabama, started a bus boycott that lasted more than a year.

The Statue of Liberty was a gift to the United States from which country?

France gave the Statue of Liberty, dedicated in 1886; it is made of copper, which is why it has turned green.

How many stars are on the flag of the United States?

50 stars stand for the 50 states; the stripes once grew too, reaching 15, until an 1818 law fixed them at 13 and left only the stars to keep growing.

Which two brothers flew the first successful airplane in 1903?

Orville and Wilbur Wright ran a bicycle shop in Dayton, Ohio; their first powered flight, with Orville at the controls, covered only 120 feet.

Alexander Graham Bell is famous for inventing which machine?

The telephone carried its first words in March 1876, when Bell called to his assistant in another room, 'Mr. Watson, come here', and Watson heard him over the wire.

What does the needle of a compass always point toward?

A compass needle points north because it is a tiny magnet that lines up with Earth's magnetic field.

The 'rex' in Tyrannosaurus rex means what?

King is the meaning of the Latin 'rex', and this 'tyrant lizard king' lived closer in time to us than to Stegosaurus, which died out about 80 million years earlier.

The remains of a plant or animal from long ago, kept in rock, are called what?

A fossil often forms when water carrying minerals seeps into buried bone or wood; the minerals slowly fill it and harden, turning it to stone.

In The Cat in the Hat, what are the Cat's two mischievous helpers called?

Thing One and Thing Two leap out of the Cat's red box and fly kites indoors in Dr. Seuss's 1957 book The Cat in the Hat.

Who keeps asking the grumpy character to try green eggs and ham in the Dr. Seuss book?

Sam-I-am pesters the narrator throughout Green Eggs and Ham, which Dr. Seuss wrote using only 50 different words to win a bet with his publisher.

In Where the Wild Things Are, what costume is Max wearing?

A wolf suit is what Max wears when he is sent to bed without supper; after his voyage he sails home to find his supper waiting, still hot.

What is a spider's web used for?

Catching food wears a web out, so many spiders roll up the old threads, eat them to recycle the silk and spin a fresh web, often every day or two.

Which object's pull causes most of the rise and fall of the ocean's tides?

The Moon pulls the sea into a bulge on the side of Earth facing it and another on the far side; the Sun raises tides too, but with only about half the force.

What force pulls a dropped ball down to the ground?

Gravity pulls heavy and light things down at the same rate when nothing else slows them, as Galileo worked out long ago; an Apollo astronaut later proved it by dropping a hammer and a feather together.

Which is the biggest planet in our Solar System?

Jupiter is the biggest planet, yet it has the shortest day of any: it spins all the way around in just under 10 hours.

Which planet is famous for its bright rings?

Saturn's rings are billions of chunks of ice and rock, thought to be the wreckage of larger bodies that broke apart close to the planet.

Which planet is nicknamed the Red Planet?

Mars looks red because its dust is full of rust, and its winds sometimes whip that dust into storms that cover almost the whole planet.

Which is the smallest planet, and the closest to the Sun?

Mercury is also the fastest planet, racing around the Sun quicker than any other, which suits a world named after the swift messenger of the Roman gods.

Which is the largest animal that lives on land?

The elephant is the largest land animal, and its trunk contains no bones at all: as many as 150,000 bundles of muscle give it both strength and a delicate touch.

Which is the biggest and heaviest bird in the world?

The ostrich cannot fly, so it runs instead, sprinting at up to 43 miles per hour and holding out its wings for balance on sharp turns.

Which are the smallest birds in the world?

Hummingbirds are the smallest birds, and their name comes from the hum of their wings, which beat dozens of times every second.

Dolphins find fish by making clicking sounds that bounce back to them, a skill called what?

Echolocation echoes reach a dolphin's inner ear through its lower jaw, and they reveal the size, shape and distance of whatever the clicks hit.

What does a snail carry on its back?

A shell is the snail's home, and it grows bigger along with the snail, so it never needs a new one. A slug is basically a snail without a shell.

How do sloths spend most of their lives?

Hanging upside down in trees, sloths even grow green algae in the grooves of their fur, a tint that helps hide them among the leaves.

Koalas eat the leaves of which tree?

Koalas eat eucalyptus leaves, which are poisonous to most other animals and so low in energy that koalas sleep about 20 hours a day.

Which bird is the national bird of the United States?

The bald eagle has been on the Great Seal since 1782, yet it only became the official national bird in December 2024, when Congress finally wrote it into law.

A frog is what type of animal?

A frog is an amphibian, a name built from Greek words for 'double life': it hatches in water, then grows legs and lungs so it can live on land too.

What is the chemical formula for water?

H2O means two hydrogen atoms joined to one oxygen atom; on their own, hydrogen and oxygen are invisible gases, yet together they make the water you drink.

Nearly all of the world's water is found where?

In the oceans: they hold about 97% of the world's water and cover about 71% of the planet's surface, so only a tiny share is fresh water that people can drink.

Which teeth usually grow in last?

Wisdom teeth arrive in the late teens or early twenties, long after a child's 20 baby teeth have gone, and often find so little room left that dentists take them out.

How many chambers does the human heart have?

Four chambers: the two on top, the atria, take blood in, and the two below, the ventricles, pump it out to the lungs and the rest of the body.

Which is the second-largest ocean in the world?

The Atlantic is the second-largest ocean, and it grows about an inch wider every year as the sea floor pulls apart along a ridge down its middle.

How many letters are in the English alphabet?

26 letters today, but schoolchildren once recited '&' as a 27th, ending the alphabet with 'and per se and', a phrase that slurred into the word ampersand.

How many keys does a modern piano have?

88 keys is far more than Mozart had: pianos of his day spanned only about five octaves, and makers kept adding keys as composers asked for more notes.

Chocolate is made from the roasted, ground beans of which plant?

Cocoa beans were so prized that the Aztecs used them as money, and for most of its history chocolate was a bitter drink, not a sweet bar.

The modern pizza was first made in which Italian city?

Modern pizza comes from Naples, where baker Raffaele Esposito is said to have made the Margherita for Queen Margherita in 1889.

Cheese is made from what?

A milk protein called casein clumps together to make it.

What do male lions have that female lions do not?

A mane marks out the male lions, yet it is the maneless females that do most of the hunting, working as a team to bring down zebra and wildebeest.

Which animal gives us wool?

A sheep's wool grows back after shearing, so it gets a haircut every year and the wool becomes sweaters, blankets and socks.

Beavers are famous for building what across streams?

Beavers build dams out of branches and mud to make ponds where they can build their lodges safely.

How do flamingos usually stand?

On one leg, a flamingo's joints lock in place, so the pose takes almost no muscle effort and the bird can even sleep that way.

Parrots are famous for being able to do what?

Parrots can copy human words; an African grey named Alex learned more than 100 and could name colours and shapes.

Chameleons are best known for being able to change their what?

Chameleons change their colour by shifting tiny crystals in their skin, mainly to signal to other chameleons and to control their temperature.

How many arms does a starfish usually have?

Five arms is the usual number, and a starfish that loses one can grow it back; a few kinds can even regrow a whole new body from a single arm.

Clownfish live safely among which creatures?

Sea anemones sting most fish, but a coat of mucus keeps a clownfish safe among their tentacles, and it repays its host by chasing off intruders and nibbling away parasites.

Where do earthworms live?

Earthworms live in the soil and tunnel through it, which lets air and water reach plant roots. That is why gardeners are happy to find them.

What do all birds have that no other living animal has?

Feathers grow on every bird and on no other living animal; insects have wings and turtles have beaks, though long ago many dinosaurs had feathers too.

What do fish use to breathe underwater?

Gills do for a fish what lungs do for us: as water flows across them, the oxygen dissolved in it passes straight into the fish's blood.

What is the nut of an oak tree called?

The nut of an oak is an acorn; squirrels bury acorns for winter, and the ones they forget can grow into new oak trees.

Wind is the natural movement of what?

Air on the move is all wind is: the Sun heats land and sea unevenly, so warm air rises and cooler air rushes in to take its place.

What do we call a piece of land completely surrounded by water?

An island can even be the top of a volcano: Hawaii's islands were built by eruptions on the sea floor that piled up until they rose above the waves.

Which gas makes party balloons float?

Helium is so light that a balloon full of it floats upward; breathe some in and your voice sounds funny, because sound travels faster through it.

Au is the chemical symbol for which metal?

Gold gets its symbol Au from aurum, its Latin name, just as silver's Ag comes from argentum, the word that also gave Argentina its name.

Which is the hardest natural substance we know of?

Diamond is pure carbon, the same element as the soft graphite in a pencil, yet its atoms lock together so tightly that only another diamond can scratch it.

Which of these metals will a magnet pull toward it?

Iron is one of the few metals a magnet pulls, along with nickel and cobalt, because its atoms act like tiny magnets that can all line up the same way.

Which number means 'nothing at all'?

Zero is written as 0, and putting it after another number makes that number ten times bigger: 1 becomes 10.

Which shape has no corners and one curved edge?

A circle is the same width whichever way you turn it, which is one reason manhole covers are round: the lid can never slip down its own hole.

Sunflowers are grown for their tasty what?

Seeds from sunflowers are eaten as snacks or pressed for cooking oil; the young plants turn to follow the Sun across the sky each day, then settle facing east.

What do we call the underground homes that rabbits dig?

Burrows dug by rabbits link up into a network called a warren, and a rabbit that senses danger thumps the ground with its back feet to warn the rest.

Milk is made by which kind of animals to feed their babies?

Mammals all do it, even the platypus, which lays eggs yet still feeds its young on milk.

Which of the four seasons is the coldest and darkest of the year?

Winter is cold because Earth tilts your half of the world away from the sun, so the days are short and the sunlight is weak.

On what date is Christmas Day celebrated?

December 25 is Christmas Day in most of the world, but some Orthodox churches still follow the older Julian calendar, so their Christmas falls on January 7.

On what date is Halloween?

October 31 is the eve of All Hallows' Day, an old name for All Saints' Day on November 1, and 'Halloween' is simply 'All Hallows' Even' squashed into one word.

What are Cinderella's special slippers made of?

Glass slippers, in the best-known telling, are the one thing the fairy godmother's magic leaves unchanged at midnight, which is how the prince finds Cinderella; the Brothers Grimm gave her gold ones.

In The Three Little Pigs, the first pig's house is made of what?

Straw is no match for the wolf, who huffs and puffs and blows the first pig's house down; only the third pig's brick house stands firm.

What does Goldilocks eat at the three bears' house?

Porridge is what the bears left to cool while they went for a walk, and Goldilocks eats Baby Bear's because it is 'just right'.

In Charlotte's Web, what kind of animal is Wilbur?

Wilbur is a pig saved from slaughter when his friend Charlotte, a barn spider, weaves words like 'Some Pig' into her web.

What kind of animal is Curious George?

A monkey, Curious George survived a real escape: his creators, Margret and Hans Rey, fled Paris in 1940 on bicycles Hans had built from spare parts, carrying his manuscript.

Who wrote the stories about Peter Rabbit?

Beatrix Potter first told Peter Rabbit's story in an illustrated letter to cheer up a sick five-year-old, then printed it herself after publishers turned it down.

What happens to Pinocchio's nose when he tells a lie?

It grows longer with each lie; in Carlo Collodi's book it gets too long to fit through the door, until the Fairy calls in woodpeckers to peck it short again.

In The Wizard of Oz, Dorothy lives on a farm in which state?

Dorothy lives on a Kansas farm with Uncle Henry and Aunt Em before a cyclone carries her to Oz in L. Frank Baum's 1900 book.

Which planet was Superman born on?

Superman was born Kal-El on the planet Krypton and was sent to Earth as a baby just before Krypton was destroyed.

On which Thursday of November is Thanksgiving in the United States?

The fourth Thursday became law in 1941, after President Franklin Roosevelt moved the holiday a week earlier to lengthen the Christmas shopping season and some states refused to switch.

Stegosaurus is famous for the big upright what along its back?

Plates like these still puzzle scientists: they may have helped Stegosaurus show off to its own kind or control its body heat, while its spiked tail did the fighting.

What does the dinosaur name Triceratops mean?

Triceratops means 'three-horned face' in Greek; it had two long brow horns and a shorter nose horn and lived about 68 to 66 million years ago.

What is the coloured part of your eye called?

The iris is the coloured ring of muscle that changes the size of the pupil to control how much light gets into your eye.

How many lungs do people have?

Two lungs sit on either side of the heart, and the left one is a little smaller to leave room for it.

What hot melted rock pours out of a volcano?

Lava is only called lava once it is outside the volcano; while it is still underground, the same melted rock is called magma.

The Amazon River is on which continent?

The Amazon flows across South America and carries more water than any other river, yet no bridge crosses it, because it runs through rainforest with few roads.

The Great Pyramid and the Great Sphinx are in which country?

Egypt's Great Sphinx spent centuries buried up to its shoulders in drifting sand and was only dug fully clear in the 1930s; it guards the pyramids at Giza.

What shape are the cells in a honeycomb?

Honeycomb cells are hexagons, a shape that fits together with no gaps and uses the least wax for the space it holds.

What is the special female ant that lays the eggs called?

A queen lays the colony's eggs, sometimes thousands of them; the workers are all female too, and the males are drones whose main job is to mate.

Winnie-the-Pooh is what kind of animal?

A teddy bear owned by Christopher Robin Milne was renamed Winnie after a real bear he loved at London Zoo, a Canadian army mascot named for the city of Winnipeg.

What is a baby goat called?

A kid was a young goat long before it was a child: the word came from Old Norse, and calling children 'kids' only caught on centuries later.

A thick, heat-trapping atmosphere makes which planet the hottest in our Solar System?

Venus is wrapped in thick carbon dioxide that traps the Sun's heat like a blanket, pushing its surface above 450 °C, hot enough to melt lead.

Which insect makes its own light at night?

A firefly, also called a lightning bug, makes light with a chemical reaction in its abdomen to attract a mate.

What tiny things cover a butterfly's wings and give them their colours?

Scales by the thousand give a butterfly's wings their colours, and they come off easily: touch a wing and they rub away like fine dust.