The periodic table has 118 elements, and I’ve watched grown adults argue about whether “Einsteinium” is a real one or something I made up. (It’s real. Element 99. They gave it to him before he died, which is more than most of us get.) That moment, the one where someone is absolutely certain about something that turns out to be wrong, is what science trivia lives on. Not the textbook recall. The overconfidence.
People who search for science trivia tend to fall into two camps. There are the ones who remember loving science class and want to prove that knowledge stuck. And there are the ones building a quiz night who need questions that don’t sound like a worksheet. I’ve written these for both. Some will feel like a warm handshake. Others will make you stare at the ceiling for a full minute before you commit.
Here are 75 questions I’ve tested on real people in real rooms. The wrong answers were often more interesting than the right ones.
1. What gas makes up roughly 78% of Earth’s atmosphere?
I start every science round with this because it sorts the room immediately. The confident people blurt oxygen. The quiet table in the corner writes nitrogen and tries not to look smug.
2. How many bones are in the adult human body?
This is a number people half-remember, and half-remembering a number is worse than not knowing it at all. You get answers ranging from 106 to 350.
3. What planet is closest in size to Earth?
Mars gets shouted before I’ve even finished reading the question. Every single time.
4. What is the hardest natural substance on Earth?
A gimme, right? Except I’ve had people say titanium, and then other people at the same table nod like that sounded reasonable.
5. What element does the chemical symbol ‘Na’ represent?
The periodic table is full of symbols that seem designed to trick trivia players. This one comes from the Latin “natrium,” which nobody remembers learning.
6. What organ in the human body produces insulin?
Liver and pancreas go head to head on this one constantly. The liver does about 500 other things, so people figure it must do this too.
7. What is the speed of light in miles per second, rounded to the nearest thousand?
People know it’s fast. They don’t know the number. Watching someone try to math their way from “186,000 miles per… hour? Second?” is genuinely entertaining.
8. What color is cobalt glass?
A question that rewards people who’ve actually been in a chemistry lab or a fancy kitchen.
9. How many chambers does the human heart have?
This should be a layup. And it usually is. But once in a while someone says two, and the table implodes.
10. What force keeps the Moon in orbit around Earth?
I include this because it’s a confidence builder, and after a few tricky ones, the room needs a win.
11. What is the most abundant element in the universe?
People who paid attention in chemistry say hydrogen instantly. People who paid attention to pop science say helium. Both groups feel sure.
12. What part of the human brain is primarily responsible for balance and coordination?
“The inner ear” is not a part of the brain, but people say it anyway and then look confused at themselves.
13. What is the chemical formula for table salt?
A solid science trivia staple. The people who get this one beam like they just won something real.
14. In what year was Pluto reclassified as a dwarf planet?
Everyone remembers it happened. Nobody remembers the year. I’ve heard guesses from 2001 to 2014.
15. What metal is liquid at room temperature?
This is one where people either know it or they spiral. I’ve heard lead, aluminum, and once, memorably, “that stuff in thermometers.” Which is technically right.
16. What scientist is credited with developing the theory of general relativity?
A breather question. Even people who can’t explain what general relativity is know this one.
17. What is the largest organ of the human body?
The room always splits between skin and liver. There’s usually at least one person who argues that skin isn’t an organ, which starts a conversation that lasts longer than the question.
18. What does DNA stand for?
People start strong with “deoxyribo…” and then trail off like a car running out of gas.
19. What is the powerhouse of the cell?
I have to include this. It’s the most memed science fact in existence. The room says it in unison, and that’s the point. Some questions are about the shared experience.
20. What temperature is the same in both Fahrenheit and Celsius?
This one creates a beautiful silence. People who know it look like they just found money in an old jacket.
21. What is the rarest naturally occurring element in Earth’s crust?
Nobody gets this. I include it because the answer is so obscure it makes people laugh.
22. What animal has the highest blood pressure of any living creature?
People guess blue whale because blue whale is the answer to every “biggest” question. This time it’s not.
23. What subatomic particle was discovered by James Chadwick in 1932?
The year is the hint, but most people don’t have a timeline of particle physics in their back pocket.
24. What is the only letter that doesn’t appear in any element name on the periodic table?
This is one of my favorite science trivia questions because people immediately start running through the alphabet in their heads and you can watch them mouth letters.
25. What phenomenon causes a stick to look bent when placed in water?
Reflection and refraction get tangled up in people’s memories like headphone wires.
26. How long does it take for light from the Sun to reach Earth?
I’ve heard everything from 30 seconds to 24 hours. The most common wrong answer is “instantly.”
27. What scientist developed the first successful polio vaccine?
There’s usually a quiet argument about whether it was Salk or Sabin. Both made polio vaccines. The question says “first successful.”
28. What is the smallest bone in the human body?
Most people know this. It’s the kind of fact that sticks from grade school for no particular reason.
29. What causes the Earth’s tides?
“The Moon” is close but not complete. This question rewards people who remember there’s a second player.
30. What vitamin does the human body produce when exposed to sunlight?
A good one for the health-conscious crowd, and there’s always at least one at every table.
31. What is the Mohs scale used to measure?
People who know this feel like geologists for a moment. People who don’t usually guess something to do with earthquakes.
32. What is the only mammal capable of true sustained flight?
“Flying squirrels” gets shouted more than you’d think. They glide. There’s a difference, and this question makes people learn it.
33. What element has the atomic number 79?
If you know your periodic table, you know this. If you don’t, you’re guessing, and guessing atomic numbers is a humbling experience.
34. What is the most electrically conductive element?
Copper. Everyone says copper. Copper is wrong.
35. What type of bond involves the sharing of electron pairs between atoms?
Chemistry class flashback. You either remember this or you’ve blocked it out entirely.
36. What is the name of the effect that causes a moving sound source to change pitch as it passes you?
Ambulance sirens. Everyone has experienced this. Not everyone remembers the name.
37. What planet has the most moons in our solar system?
This answer has changed recently, which means anyone with slightly outdated knowledge is about to learn something.
38. What is the half-life of carbon-14?
People know carbon dating is a thing. Fewer people know the actual number. I give full marks for anything within 500 years.
39. What is the term for an organism that can produce its own food using light, water, or chemicals?
The word is on the tip of everyone’s tongue. Half the room says “photosynthesis” which is the process, not the organism.
40. What human body system includes the thymus, spleen, and lymph nodes?
The thymus is the clue that throws people. Most people forget the thymus exists, and those who remember it aren’t sure which system it belongs to.
41. Is a tomato a fruit or a vegetable?
I know. I know. But I include it because no other question generates this much noise. Botanists say one thing, the Supreme Court literally said another, and your grandmother has her own opinion.
42. How many senses does a human have?
“Five” comes out of every mouth like a reflex. And it’s wrong. Or at least incomplete.
43. What percentage of the human brain do we use?
If someone says 10%, they’ve been lied to by a movie. This question is an intervention.
44. What is the closest star to Earth after the Sun?
Alpha Centauri is the popular answer, and it’s close to right. But there’s a distinction that matters.
45. What color is a mirror?
This stops rooms cold. People stare at you. “Silver” is the most common answer. “It depends on what’s in front of it” is the philosopher’s answer. Neither is quite right.
46. What is the most common blood type in humans worldwide?
This varies by region, which is why people argue about it. The question says worldwide, which narrows it.
47. Glass is a solid. True or false?
The “glass is actually a liquid” myth is one of the most persistent in all of science trivia. I love asking this because people who think they’re being clever get caught.
48. What is heavier: a pound of feathers or a pound of gold?
Before you roll your eyes, listen. This is a trick question, but not the way people think.
49. How many states of matter are there?
“Three” is the answer from grade school. “Four” is the answer from high school. The real answer is bigger than both.
50. What was the first element created in a laboratory?
A question that rewards the history-of-science crowd. Most people don’t realize we’ve been making elements for nearly a century.
51. What is the only planet in our solar system that rotates clockwise when viewed from above its north pole?
People guess Uranus because Uranus is always the weird one. And it is weird, but not in this way. Well, sort of.
52. What is the name of the boundary between Earth’s crust and mantle?
Geology doesn’t come up often in trivia, which means when it does, it separates the field.
53. What does the “pH” in pH scale stand for?
People use this term all the time. Almost nobody knows what the letters mean.
54. What is the approximate age of the Earth?
I give credit for anything between 4 and 5 billion. The exact answer is more precise than most people expect.
55. What scientist is known as the father of modern taxonomy?
This one plays well with biology people and leaves everyone else blinking.
56. What particle is responsible for giving other particles mass, confirmed by CERN in 2012?
The nickname for this one is so famous that people sometimes forget the real name.
57. What is the largest known structure in the universe?
This changes as astronomers find bigger things, which happens more often than you’d think.
58. What is the only element named after a living person at the time of its naming?
Most elements named after people were named posthumously. One broke that pattern.
59. What phenomenon explains why the sky is blue?
People know the sky is blue. Fewer people can name the mechanism. “Because of the ocean” is not correct, though I hear it more than I should.
60. What is the densest naturally occurring element?
Lead is the gut answer. Lead is not even close.
61. What was the first antibiotic discovered?
Penicillin is the famous answer, and it’s correct. But the story behind it is better than most people remember.
62. What is the Chandrasekhar limit?
This is a filter question. If someone knows it, they know astrophysics. If they don’t, they’re guessing wildly.
63. What is the process by which plants lose water through their leaves?
Evaporation is close but not the word we’re looking for. Photosynthesis gets shouted by people who aren’t really listening to the question.
64. What is the only letter that doesn’t appear in the spelling of any U.S. state?
Wait, that’s not science. But I’m leaving it because it plays beautifully between science questions as a palate cleanser, and the mental process is the same. Just kidding. Here’s the real one:
64. What type of rock is formed from cooled magma or lava?
Three types of rock. Everyone learned them. Two-thirds of the room has forgotten at least one.
65. How many chromosomes do humans have?
People who know say 46 instantly. People who half-know say 23, which is the number per gamete, not per cell. Close enough to hurt.
66. What is the name for a material that doesn’t conduct electricity?
Simple enough, but people freeze between two words and sometimes pick the wrong one.
67. What was the first animal to be cloned from an adult somatic cell?
Everyone remembers the name. Not everyone remembers the species, which tells you something about how science gets filtered through popular culture.
68. What law states that energy cannot be created or destroyed, only transformed?
People know the concept. The specific name trips them up between “conservation of energy” and the thermodynamics numbering.
69. What is the name of the theoretical boundary around a black hole beyond which nothing can escape?
Most people know this one from movies and podcasts. It’s become part of the cultural vocabulary.
70. What is the most abundant protein in the human body?
Hemoglobin gets guessed a lot. Keratin gets guessed. Both wrong.
71. What is the term for the minimum energy required to start a chemical reaction?
Chemistry students perk up. Everyone else starts writing “threshold energy” and hoping for partial credit.
72. What organ can regenerate itself even after up to 75% of it has been removed?
The answer to this one makes people feel like the human body is more resilient than they gave it credit for.
73. What was the name of the NASA rover that landed on Mars in February 2021?
Recent enough that people should know it, old enough that the name has started to slip.
74. What is the only vitamin that can be synthesized by all living organisms except humans and guinea pigs?
The guinea pig detail is the hint. And it’s also the detail that makes this question stick in people’s memories for years.
75. If you could stand on the surface of Venus, what direction would you see the Sun rise?
This is the question I save for last because it requires you to hold two facts in your head at the same time and combine them. You need to know that Venus rotates backwards, and then you need to think about what that means for someone standing on it. The room goes quiet. People draw circles on their napkins. Someone traces a path in the air with their finger. And then the answer clicks, and the person who gets it looks like they just solved something that matters.
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