Weird Science Trivia
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99 free Weird Science trivia questions with answers — science & nature quiz, new questions added Oct 2026.
Weird science trivia is the good stuff: a planet whose day outlasts its year, a shrimp whose claw makes a flash hotter than the Sun's surface, a frog that spends winter frozen with no heartbeat, and a cloud near the centre of the galaxy that is full of alcohol. These 99 questions collect the facts that make people say 'that can't be right' and then look it up. The set mixes astronomy, animal biology, the human body, physics, chemistry, weather and plants and fungi, so nobody's specialism carries them through. Difficulty runs from easy warm-ups (how many hearts an octopus has) to genuinely tough (which receptor birds lack that lets them eat chillies unbothered). Every question has four options and a short explanation that adds one more strange detail. Every answer here was checked against a cited source before publishing, and the source is shown with each question, so it works for a science classroom, a pub quiz round or settling an argument at dinner.
30 of 99 questions with answers and explanations. Play the quiz
Q 01On which planet does a single rotation take longer than a full trip around the Sun?
Venus
Venus turns so slowly, and backwards, that one spin takes 243 Earth days against 225 for its orbit; seen from its surface, the Sun would rise in the west.
Q 02Which planet is the only one in the Solar System less dense than water?
Saturn
Saturn's average density is about 0.69 grams per cubic centimetre, so in theory it would float in a big enough bath, even though it has 95 times Earth's mass.
Q 03Which planet's day, from one sunrise to the next, lasts twice as long as its own year?
Mercury
Mercury spins three times for every two trips round the Sun, and that slow turn makes the Sun crawl across its sky: sunrise to sunrise takes about 176 Earth days, two full Mercury years.
Q 04A sugar cube of material from which of these objects would weigh about as much as a mountain?
Neutron star
A neutron star packs more than the Sun's mass into a ball about 20 km across, a squeeze so fierce that its protons and electrons have merged into neutrons.
Q 05The molecular cloud Sagittarius B2 near the Milky Way's centre contains large amounts of what?
Alcohol
Alcohol fills the cloud as ethanol, methanol and vinyl alcohol; astronomers scanning it for amino acids in 2009 found instead ethyl formate, a chemical that helps give raspberries their flavour.
Q 06Solar eclipses look perfect because the Sun is about 400 times wider than the Moon and also 400 times what?
Farther away
Farther away, so the two discs look almost equal in size from Earth; the match won't last, because the Moon drifts about 3.8 cm outward each year and will one day be too small to cover the Sun.
Q 07Viewed from space, what colour is the Sun?
White
White, because sunlight blends every colour of the spectrum; from the ground it looks yellow, orange or red only because the atmosphere scatters the shorter wavelengths out of the beam.
Q 08What colour are sunsets on Mars, thanks to fine dust scattering the light?
Blue
Blue, the reverse of Earth: Mars has a butterscotch sky by day, but its fine dust lets that one colour through slightly more easily, so a cool glow hangs around the setting Sun.
Q 09On Uranus and Neptune, methane is thought to be squeezed into what, which falls through the interior?
Diamonds
Diamonds were made in the lab to test the idea: laser shock waves fired through plastic mimicked the planets' interiors and locked nearly every carbon atom into tiny diamonds.
Q 10About 100 billion of which particles from the Sun pass through your thumbnail every second?
Neutrinos
Neutrinos carry no electric charge and almost no mass, so they hardly ever interact with matter: they stream through you, and then through the whole Earth, without leaving a trace.
Q 11Which sea animal has three hearts?
Octopus
An octopus has one heart for its body and one for each gill; the extra pumps are thought to make up for its copper-based blood, which takes high pressure to push round.
Q 12Which microscopic animals survived direct exposure to the vacuum of space on a 2007 satellite mission?
Tardigrades
Tardigrades were sent up dried out and dormant; the vacuum alone did them no measurable harm, and once rehydrated on Earth they revived and laid eggs as normal.
Q 13Turritopsis dohrnii is nicknamed 'immortal' because the adult can revert to its juvenile form; what kind of animal is it?
Jellyfish
A jellyfish smaller than a little fingernail: when injured or starving, the adult shrinks into a blob on the seabed and regrows as a polyp, its earlier life stage, within a day or two.
Q 21Which shrimp's colonies crackled so loudly that they interfered with US Navy sonar in World War II?
Pistol shrimp
Pistol shrimp are smaller than a thumb, but each snaps one oversized claw, and the Navy had to call in wartime researchers to trace the din to dense beds of the tiny animals.
Q 22Which beetle defends itself with a near-boiling chemical spray from its abdomen?
Bombardier beetle
The bombardier beetle makes its weapon only at the instant of use: chemicals react in a chamber at its rear, heating the mix almost to boiling and blasting it out in rapid pulses.
Q 23Which animal's heart rate can drop to just two beats per minute during a deep dive?
Blue whale
Q 14Which Australian marsupial's cube-shaped droppings won a 2019 Ig Nobel Prize for Physics?
Wombat
Wombat intestines do the sculpting: stretchy and stiff zones in the gut wall mould the droppings into cubes, which don't roll away from the piles that mark the animal's territory.
Q 15The platypus hunts underwater with its eyes, ears and nostrils closed, relying on which sense instead?
Electrolocation
Electrolocation: sensors in its bill pick up the faint electric signals given off by the twitching muscles of its prey, so it can find a meal in murky water with its eyes shut.
Q 16Which tree-dwelling mammal can hold its breath underwater for up to 40 minutes?
Sloth
Sloth: it stretches a breath by slowing its heart, and though almost helpless on the ground it is a capable swimmer, moving about three times faster in water than on land.
Q 17Which burrowing rodent can survive 18 minutes without any oxygen by switching its cells to burn fructose?
Naked mole-rat
The naked mole-rat lives packed into airless tunnels with hundreds of colony mates; starved of oxygen it stops moving, slows its pulse and runs on fructose, as plants do.
Q 18Which North American amphibian winters frozen solid, with no heartbeat, breathing or brain activity?
Wood frog
The wood frog floods its cells with glucose, a natural antifreeze, as ice forms under its skin; it sits rock-hard all winter, then thaws in spring and hops off to breed.
Q 19The oldest known individual of which species was estimated at 392 years old, give or take 120?
Greenland shark
The Greenland shark was aged by carbon-dating proteins in its eye lenses, which form before birth and are never replaced; it grows less than a centimetre a year.
Q 20The peacock mantis shrimp's strike creates what in the water, hitting prey a second time?
Cavitation bubbles
Cavitation bubbles form because the club moves so fast that the water beside it vaporises; their collapse lands a second blow, so even a punch that misses can stun or kill.
Blue whale heartbeats were first recorded in 2019 by a sensor tag stuck to one animal: its pulse sank as low as two beats a minute in a dive, then raced to 37 at the surface.
Q 24What colour is horseshoe crab blood, harvested to test for bacterial contamination?
Bright blue
Bright blue blood carries cells that clot around the faintest trace of bacterial toxin, which is why an extract of it is used to check that vaccines and injectable drugs are clean.
Q 25With which body part does a female butterfly taste a leaf before laying eggs?
Feet
Feet: the sensors there work only on contact, so by standing on a leaf she can taste whether her caterpillars will be able to eat it.
Q 26Which mammals may live more than 200 years, making them the longest-lived of all?
Bowhead whales
Bowhead whales have been caught still carrying stone harpoon tips from hunts long past, proof of lives well over a century; newer dating methods push the estimate past 200 years.
Q 27When startled, some sea cucumbers defend themselves by doing what?
Expelling their internal organs
Expelling their internal organs through the anus can startle or distract an attacker, and the sea cucumber simply regrows the missing parts afterwards.
Q 28Experiments that dressed horses in striped coats support which explanation for a zebra's stripes?
To deter biting flies
To deter biting flies: horse flies approached striped coats as often as plain ones but failed to slow down in time, so they overshot or bounced off instead of landing.
Q 29The 'zombie' fungus Ophiocordyceps unilateralis hijacks which insects, making them climb a plant and clamp onto a leaf?
Ants
Ants infected by it lock their jaws onto a leaf vein about 25 cm above the forest floor, where the humidity suits the fungus; it then kills the ant, grows out of the body and sheds spores to infect more.
Q 30Once said to outnumber our cells ten to one, the body's microbes are now put at how many by comparison?
About the same
About the same: a 2016 recount found roughly 1.3 bacteria for every human cell in a typical adult, replacing a ten-to-one figure that had been widely quoted but hardly ever checked.