43 Math Trivia Questions [With Answers]

Most math trivia asks you to multiply. The best math trivia makes you realize you’ve been wrong about infinity your whole life.

These 43 math trivia questions span mind-bending paradoxes, the strangest stories of famous mathematicians, geometry that breaks Euclid, number theory oddities, and probability gotchas that beat casinos. LearnClash picked questions where the intuitive answer is wrong, because confident wrong answers are what make trivia memorable.

Below you’ll find every answer plus a breakdown of why each math trivia question trips people up. Test your math knowledge in a quiz duel →

Math Trivia Questions: Quick Category Guide

Section	Questions	Easy	Medium	Hard
Mind-Bending Numbers	1-5	1	2	2
Mind-Bending Paradoxes	6-12	1	3	3
Famous Mathematicians	13-19	1	4	2
Number Theory Oddities	20-25	2	2	2
Geometry Surprises	26-31	2	2	2
Probability Gotchas	32-34	1	1	1
Math Hiding in Plain Sight	35-39	2	2	1
Historical Oddities	40-43	1	2	1

43 math trivia questions across 8 categories, from one-line brainteasers to proofs that broke mathematicians.

When we built out the math trivia questions category in LearnClash, the pattern was clear: paradox questions produce the widest accuracy gap. The easy ones land for most players. Banach-Tarski-level proofs trip up nearly everyone. Probability questions tie with geometry for most-missed overall. The surprise was famous mathematicians: players who could name every physicist of the last century collapsed on anything pre-1900. (If you want a broader warm-up first, try our 43 science trivia questions and answers or 43 general knowledge trivia questions.)

Mind-Bending Numbers (Questions 1-5)

In LearnClash, mind-bending number questions produce the biggest upsets in math duels. Players who ace arithmetic melt on questions about scale. These five math trivia questions each involve a number so large that human intuition simply gives up.

5 questions about numbers so big they stop feeling like numbers.

Challenge a friend to an arithmetic duel on LearnClash →

1. Shuffle a standard 52-card deck thoroughly. What’s the chance the order has ever come up before in card-playing history? (Easy)

Answer: Almost zero. There are 52! possible orderings, which works out to roughly 8 × 10⁶⁷. That’s more than the estimated atoms in our galaxy.

Why it stumps people: Your gut says “surely someone has shuffled this way before.” But 52 factorial is so gigantic that every properly shuffled deck is almost certainly a sequence that has never existed and never will again. If every human who ever lived had been shuffling decks once per second since the Big Bang, we’d still have explored a fraction of a fraction of the possibilities.

2. How big is a googolplex compared to the number of atoms in the observable universe? (Medium)

Answer: Vastly bigger. The universe holds around 10⁸⁰ atoms. A googolplex is 10^googol, or 1 followed by 10¹⁰⁰ zeros. You physically could not write it out.

Why it stumps people: A googol already dwarfs the atom count by 20 orders of magnitude. A googolplex is a whole tower of zeros past that, with more zeros than atoms available to record them. The word “googolplex” sounds playful, so the scale sneaks up on you.

3. Graham’s number was used as an upper bound in which field of math, and why is it “too big to write in the universe”? (Hard)

Answer: Ramsey theory, namely a problem about coloring hypercube edges. Even if every digit occupied a Planck volume, the observable universe couldn’t hold its decimal form.

Why it stumps people: It’s so big that even the number of digits in its number of digits is incomprehensibly huge. Ronald Graham introduced it to Martin Gardner for a 1977 Scientific American column. What got memorized was the scale, not the setting.

4. Which defined finite number dwarfs Graham’s number so completely that Graham’s number is effectively zero by comparison? (Hard)

Answer: TREE(3), from Kruskal’s tree theorem.

Why it stumps people: TREE(1) is 1. TREE(2) is 3. Then TREE(3) explodes into a value so unfathomably large that saying “Graham’s number is smaller than TREE(3)” barely captures the gap. Most people have never heard of it, because explaining it needs graph theory most of us quietly avoided in college.

But here’s where it gets interesting.

5. Place one grain of wheat on square 1 of a chessboard, then double it on every next square. How many grains are on the whole board? (Medium)

Answer: 18,446,744,073,709,551,615 grains. That’s 2⁶⁴ minus 1, and it’s about 1,400 times global annual wheat production.

Why it stumps people: Exponential growth destroys intuition. The legend says an ancient king laughed at an inventor who requested this payment, until his treasurer ran the math. By square 32, you’re already at 4 billion grains. Every doubling after that is a fresh disaster for the king.

Mind-Bending Paradoxes (Questions 6-12)

Paradoxes are where math trivia questions earn their fame. The “why it stumps” field widens from “tricky” to “I thought I understood reality.” In LearnClash duels, players split almost evenly between “got it right away” and “still disagrees with the answer.” None of these involve a trick. They’re real theorems.

7 paradoxes that pass peer review and still break intuition.

6. How many pieces do you need to cut a solid ball into so you can reassemble them into two identical copies of the original, using only rotation? (Hard)

Answer: As few as 5 pieces. It’s the Banach-Tarski paradox.

Why it stumps people: It seems to violate conservation of volume. The trick is that the “pieces” are infinite scatterings of points (non-measurable sets) with no defined volume. The result only works if you accept the Axiom of Choice. Paper-and-scissors intuition fails because you can’t cut this way in the real world.

7. Gabriel’s Horn, formed by rotating y = 1/x around the x-axis for x ≥ 1, has a volume of exactly π. What about its surface area? (Hard)

Answer: Infinite.

Why it stumps people: It’s the Painter’s Paradox. You can fill the horn with a finite amount of paint, yet no amount of paint can coat the outside. The integrand for volume (1/x²) converges. The integrand for surface area (about 1/x) diverges. Physics brains rebel. The math doesn’t. Play a calculus duel on LearnClash →

8. Are there exactly as many even numbers as natural numbers? (Medium)

Answer: Yes. Both are countably infinite, with cardinality aleph-null (ℵ₀). Georg Cantor proved different infinities have different sizes.

Why it stumps people: Intuition says there are “half as many” evens. But you can pair each natural number with its double, so the two sets have the same size. The real numbers are a genuinely larger infinity. That was the blow Cantor landed on 19th-century math.

Did you know? Cantor’s diagonal proof that the real numbers are uncountable takes about four lines to write down. It’s one of the shortest proofs of a world-changing result in the history of math.

9. A theorem says that right now, two points on Earth exactly opposite each other have identical temperature AND air pressure. What’s it called? (Medium)

Answer: The Borsuk-Ulam theorem.

Why it stumps people: It sounds impossible. It isn’t. The theorem says any smooth map from an n-sphere to n-dimensional space sends some pair of antipodal points to the same value. Temperature and pressure are smooth over the Earth’s surface, so the antipodal match is a given.

10. The coastline of Britain is measured at 2,800 km with a 100 km ruler, 3,500 km with a 50 km ruler, and over 8,000 km with a 1 km ruler. What’s its true length? (Medium)

Answer: There isn’t one. Coastlines behave like fractals. As the ruler shrinks, the measured length tends toward infinity.

Why it stumps people: You assume “length” is a property of the coastline itself. It’s not. It’s a property of your measurement. Benoit Mandelbrot developed fractal geometry partly to describe this. The fractal dimension of a real coastline sits between 1 and 2.

11. In any sufficiently rich mathematical system (like arithmetic), which of these is impossible? (Medium)

Answer: Being both complete and consistent. Kurt Gödel’s 1931 Incompleteness Theorems guarantee there will always be true statements you can’t prove inside the system.

Why it stumps people: It crushed David Hilbert’s dream of a complete axiomatic foundation for mathematics. Gödel was 25 when he proved it. Many non-mathematicians still quietly hope there’s a loophole. There isn’t.

12. Does 0.999… (repeating forever) equal 1? (Easy)

Answer: Yes, exactly. Not “really close.” The same number in two outfits.

Why it stumps people: Multiple proofs kill any doubt. If x = 0.999…, then 10x = 9.999…, so 10x minus x equals 9, hence x equals 1. Also 1/3 equals 0.333…, and 3 × (1/3) equals 0.999…, which equals 1. And there’s no number you can fit between 0.999… and 1, so they must be the same number. Most people still argue.

Famous Mathematicians (Questions 13-19)

Math is a human story, and the humans are stranger than the equations. These famous mathematicians questions in LearnClash cover lives that were shorter, poorer, or more dramatic than a Netflix miniseries. If you only know the physicists, these seven will catch you flat.

7 mathematicians whose biographies read like fiction.

Play a famous mathematicians duel on LearnClash →

13. What number did Ramanujan famously identify as “the smallest expressible as the sum of two cubes in two different ways,” from a hospital bed in 1918? (Medium)

Answer: 1729. It equals 1³ + 12³ and also 9³ + 10³. It’s now called the Hardy-Ramanujan number.

Why it stumps people: G. H. Hardy visited Ramanujan in the hospital and called his taxicab number “dull.” Ramanujan spotted the sum-of-two-cubes property instantly. The anecdote stuck because it’s one of the purest displays of number sense ever recorded.

14. How old was Évariste Galois when he died in a duel in 1832, after writing a letter asking a friend to publish his mathematical work? (Hard)

Answer: 20 years old.

Why it stumps people: The popular myth is that he invented group theory the night before he died. The truth is richer. Most of his key work was done between 1829 and 1831. The letter on the final night asked a friend to preserve what already existed. Either way, group theory came from a 20-year-old who was about to lose a pistol fight.

15. Which mathematician refused both the Fields Medal (2006) and a $1 million Millennium Prize (2010) for proving the Poincaré conjecture? (Easy)

Answer: Grigori Perelman. He remains the only person ever to decline the Fields Medal.

Why it stumps people: Perelman’s quote about fame is widely reported: “I’m not interested in money or fame. I don’t want to be on display like an animal in a zoo.” He’s said to live on his mother’s pension in Saint Petersburg. The Clay Mathematics Institute still has the $1 million in its budget, unclaimed.

Did you know? The Poincaré conjecture was open for 99 years before Perelman cracked it. He posted his proof in three short papers on arXiv in 2002 and 2003, then refused to publish in a peer-reviewed journal.

16. Who was the first female mathematician known to history, killed by a mob in 415 CE in Alexandria? (Hard)

Answer: Hypatia of Alexandria.

Why it stumps people: She wrote commentaries on Diophantus’s Arithmetica and Apollonius’s Conic Sections. A Christian mob dragged her from her carriage and killed her with ostraka (roof tiles or pottery shards). Most people have never heard of her. Carl Sagan brought her story back to mainstream audiences in Cosmos in 1980.

17. Which famous ancient Greek mathematician was killed by a Roman soldier during the siege of Syracuse, said to have been drawing geometric figures in the sand? (Medium)

Answer: Archimedes, in 212 or 211 BCE.

Why it stumps people: The Roman general Marcellus had ordered that Archimedes not be harmed. The iconic line “Do not disturb my circles!” is legendary but doesn’t show up in any ancient source. It’s a 19th-century flourish that everyone now quotes as if it were Plutarch.

18. What’s the sum 1 + 2 + 3 + … + 100, and how did a young Carl Friedrich Gauss compute it in seconds as a schoolchild? (Medium)

Answer: 5,050. Gauss paired first-and-last (1+100), second-and-second-last (2+99), and so on, getting 50 pairs of 101.

Why it stumps people: It’s the classic reframing trick that leads to the formula n(n+1)/2. Historians note the anecdote may be embellished (nobody’s sure which method young Gauss used), but the insight is real and still taught to first-year students.

19. Sophie Germain proved Fermat’s Last Theorem for a large class of primes. What pseudonym did she use to submit her work, because she was a woman? (Medium)

Answer: “M. Le Blanc” (Monsieur Le Blanc). She wrote as a man in her correspondence with Gauss and Lagrange.

Why it stumps people: Gauss only learned she was a woman after a mutual friend revealed her identity. “Sophie Germain primes” are still named after her today. She was self-taught, because the École Polytechnique didn’t admit women.

Number Theory Oddities (Questions 20-25)

Number theory is where math trivia questions and answers get sneaky. Each one feels simple until you see how much machinery is hiding behind it. LearnClash uses these six to cover the primes, the perfect numbers, and the conjectures that have stayed unsolved for centuries. Two of the questions below are still officially unproven in 2026.

6 number theory questions where the primes refuse to sit still.

Test your number theory knowledge on LearnClash →

20. Is there a largest prime number? (Easy)

Answer: No. Euclid proved around 300 BCE that there are infinitely many primes.

Why it stumps people: His proof is elegantly short. Assume a finite list of primes, multiply them all together, then add 1. The result is either a new prime not on your list, or it has a prime factor not on your list. Either way, the list is incomplete. This is one of the oldest proofs still taught verbatim.

21. How long did it take for Fermat’s Last Theorem (scribbled in a margin around 1637) to be proved? (Medium)

Answer: 358 years. Andrew Wiles published the proof in 1995, after announcing in 1993 and patching a hole in 1994.

Why it stumps people: Fermat claimed he had a proof “too large for this margin.” Nobody else found one for three and a half centuries. Wiles couldn’t win a Fields Medal because he was over 40. He got a special silver plaque instead. The Wiles proof uses modular forms and elliptic curves that Fermat couldn’t possibly have known about.

Key takeaway: Some math problems stay unsolved not because they’re impossibly hard, but because the right tools haven’t been invented yet. Wiles’s proof needed machinery built in the 1950s.

22. What are the first three “perfect numbers” (integers equal to the sum of their proper divisors)? (Medium)

Answer: 6, 28, 496. Then 8,128. For example, 6 equals 1 + 2 + 3, and 28 equals 1 + 2 + 4 + 7 + 14.

Why it stumps people: Every known perfect number is even, and connects one-to-one with a Mersenne prime. Whether any odd perfect number exists is still unsolved. We’ve checked up to 10¹⁵⁰⁰. Still no luck.

23. Why isn’t 1 considered a prime number? (Easy)

Answer: Because it would break unique prime factorization. If 1 were prime, you could write 6 as 2×3, or 1×2×3, or 1×1×2×3, and so on forever.

Why it stumps people: The modern convention was adopted to keep the Fundamental Theorem of Arithmetic clean. Historically, some mathematicians did count 1 as prime. The rule is a choice, not a discovery, and that surprises people who assume math definitions fall from the sky.

24. What’s the simplest unsolved problem in math, stated in words any child can understand, yet unproven since 1937? (Hard)

Answer: The Collatz conjecture. Start with any positive integer. If even, halve it. If odd, triple it and add 1. Repeat. The conjecture says you always reach 1.

Why it stumps people: Computers have checked it up to 2.36 × 10²¹. Terence Tao proved it for “almost all” integers in 2020. And yet nobody has proved it for all integers. Paul Erdős said math isn’t ready for problems like this.

25. Is every even number greater than 2 the sum of two primes? (Hard)

Answer: Conjectured yes, but Goldbach’s conjecture remains unproven since 1742, despite verification up to 4 × 10¹⁸.

Why it stumps people: Christian Goldbach proposed it in a letter to Euler. It’s one of the oldest open problems in mathematics. The statement is so simple a third grader can check it on small numbers, yet it has defied every attack for nearly 300 years.

Geometry Surprises (Questions 26-31)

Euclid’s geometry was right for 2,200 years. Then the surface got curved, the strip got twisted, and the bottle stopped having an outside. These six geometry questions in LearnClash live where Euclidean rules stop holding. None of them are trick questions. They’re all rigorously proven.

6 geometry questions where the shapes break the rules.

Play a geometry duel on LearnClash →

26. Wrap a rope tightly around Earth’s equator. Add just 1 meter of extra length and lift it uniformly off the ground. How high off the surface is the rope? (Medium)

Answer: About 16 cm. A cat can walk under it. The gap is 1/(2π) meters regardless of the planet’s size.

Why it stumps people: Intuition says the extra meter “disappears” around Earth’s 40,000 km circumference. It doesn’t. The gap size depends only on the added length, not the starting radius. You’d get the same 16 cm around a tennis ball.

27. If you cut a Möbius strip in half down the middle lengthwise, what do you get? (Easy)

Answer: One longer strip with four half-twists, not two separate strips.

Why it stumps people: A Möbius strip has only one side and one edge, so cutting down the middle doesn’t separate it. Try it with a paper strip and tape. Cut a third of the way across instead and you get two strips linked together. It’s one of the cheapest parlor tricks in mathematics.

28. How many Platonic solids (convex regular polyhedra) exist in three-dimensional space? (Easy)

Answer: Exactly 5. Tetrahedron, cube, octahedron, dodecahedron, icosahedron.

Why it stumps people: Not 6, not 10. Provably exactly 5, as shown by Euclid. The constraint comes from the angles meeting at each vertex summing to less than 360°. There’s no room for a sixth.

29. On a globe, can you draw a triangle whose three interior angles each measure 90°? (Medium)

Answer: Yes. Start at the North Pole, go down two meridians that are 90° apart, then connect them along the equator. All three angles are 90°, summing to 270°.

Why it stumps people: “Triangles have 180°” is only true in flat (Euclidean) geometry. On a sphere, triangle angles always sum to more than 180°. On a saddle-shaped surface, they sum to less. Most of us learned one geometry in school and assumed it was the geometry.

30. A single-sided surface with no inside or outside, that can’t even be built in 3D without passing through itself, is called what? (Medium)

Answer: The Klein bottle.

Why it stumps people: Unlike a sphere, a Klein bottle has no enclosed volume. Whatever you “pour in” just comes back out. Real 3D models cheat by passing through themselves. The true Klein bottle only exists cleanly in four dimensions.

31. What’s the minimum number of colors you need to color any map on a flat plane so that no two bordering regions share a color? (Hard)

Answer: Four. Proved in 1976 by Kenneth Appel and Wolfgang Haken, controversially, because it was the first major theorem proved by computer.

Why it stumps people: The guess dates from 1852. Mathematicians were uneasy for decades because no human could check all 1,936 cases by hand. The computer ran for over 1,000 hours. Some still find the proof strange, even though it has been checked and rebuilt by other teams since.

Probability Gotchas (Questions 32-34)

Probability is where human intuition goes to die. These three math trivia questions each cost real people real money when the math came back different from the gut feeling. They’re also the questions that most often produce “that can’t be right” reactions in LearnClash duels.

3 probability questions that broke casinos and game shows.

32. How many people do you need in a room for a better-than-50% chance that two share a birthday? (Easy)

Answer: Just 23.

Why it stumps people: Most people guess 183 because it feels like “half of 365.” The trick is you’re comparing every possible pair, not every person against one date. 23 people create 253 pairs, and the math compounds faster than intuition predicts.

33. On the Monty Hall game show, you pick door #1. The host opens door #3 to reveal a goat. Should you switch to door #2? (Medium)

Answer: Yes, always switch. Switching wins 2/3 of the time. Staying wins 1/3.

Why it stumps people: It feels like 50/50 between the two remaining doors, but the host’s knowledge changes the math. Your original 2/3 chance of being wrong transfers entirely to the unopened door. Statisticians, PhDs, and Marilyn vos Savant’s critics all famously got this one wrong in public before the math checked out.

And that’s where probability really lives.

34. On August 18, 1913, a roulette wheel at Monte Carlo Casino landed on black how many times in a row, costing gamblers millions as they bet on red? (Hard)

Answer: 26 times in a row.

Why it stumps people: Each spin is independent. Previous outcomes don’t influence the next. Gamblers lost fortunes betting “red is due.” The event became the textbook example of the gambler’s fallacy, also called the Monte Carlo fallacy after that very night. Casinos have been quietly thanking probability theory ever since.

Math Hiding in Plain Sight (Questions 35-39)

Some of the best fun math facts don’t sound mathematical at all. They sound botanical, architectural, or plain mysterious. LearnClash leans on this category because the answers turn everyday objects into proofs. Once you see the math, you can’t unsee it.

5 places math shows up where no one asked for it.

35. In a sunflower head, the spirals of seeds almost always match two consecutive numbers in which famous sequence? (Easy)

Answer: The Fibonacci sequence. Common patterns: 34 spirals one way, 55 the other. Or 55 and 89.

Why it stumps people: It’s a real packing phenomenon, not folklore. The golden angle (about 137.5°) between consecutive seeds maximizes density. Some “golden ratio in nature” claims are inflated, but this one is well-documented in botany papers going back to 1979.

36. Bees build honeycombs using hexagons. Is this really the most efficient shape for dividing a plane into equal-area cells? (Medium)

Answer: Yes. Proven in 1999 by Thomas C. Hales. Regular hexagons minimize the total perimeter.

Why it stumps people: The conjecture dates to Pappus of Alexandria around 300 CE. It took 1,700 years to prove what bees already “knew.” Hales’s 1999 paper on arXiv runs 19 pages and relies on a rigorous perimeter-minimization argument across all possible tilings.

37. What equation connects five of mathematics’ most important constants (0, 1, π, e, and i) in a single line? (Medium)

Answer: Euler’s identity: e^(iπ) + 1 = 0.

Why it stumps people: It was voted “most beautiful theorem in mathematics” by readers of The Mathematical Intelligencer in 1990, and tied with Maxwell’s equations for “greatest equation ever” in a 2004 Physics World poll. What stumps people is that all five constants come from totally different branches of math, yet they meet on one line.

38. Pick two random positive integers. What’s the probability they share no common factor greater than 1? (Hard)

Answer: 6/π² ≈ 60.79%.

Why it stumps people: Pi shows up in a problem with no circle in sight. The result comes from the Basel problem (the sum of 1/n² equals π²/6), which Euler solved in 1735. The appearance of π in pure number theory is one of math’s weirdest recurring jokes.

39. What’s the largest known prime number as of 2026? (Easy)

Answer: M136279841, which equals 2^136,279,841 − 1. It has 41,024,320 decimal digits.

Why it stumps people: It was discovered on October 12, 2024, by Luke Durant, and it’s the first Mersenne prime found using GPUs instead of CPUs. The previous record was 16 million digits shorter. Primes this big take months of computing time to verify.

Historical Oddities (Questions 40-43)

These four math history questions each contain a detail that sounds invented. A nine-year-old who named a number. A cult killing over an irrational. The Persian scholar whose name became a word you use every day. LearnClash favors this kind of question because they’re verifiable yet feel like myth. That’s the sweet spot for trivia.

4 math history questions that sound made up and aren’t.

Challenge a friend to an algebra duel on LearnClash →

40. Who invented the word “googol” (1 followed by 100 zeros)? (Easy)

Answer: A 9-year-old boy named Milton Sirotta, in 1920. He was the nephew of mathematician Edward Kasner.

Why it stumps people: The term later inspired the company name “Google” via misspelling. Kasner asked his nephews to invent a name for a big number on a walk in the New Jersey Palisades. Milton tossed out “googol.” It stuck.

41. Which mathematician first used zero as a real number (not just a placeholder) in 628 CE, including rules for arithmetic with it? (Medium)

Answer: Brahmagupta, in his Brahmasphutasiddhanta.

Why it stumps people: He was the first to treat zero as an actual number instead of a position marker. He also defined rules for adding, subtracting, and multiplying with it. His rule for dividing by zero was wrong, but he was the first to ask the question, which is half the work.

42. What mathematical discovery allegedly got a Pythagorean cult member killed for revealing its existence? (Hard)

Answer: The square root of 2 is irrational. The legend says Hippasus of Metapontum proved it around 500 BCE, and was drowned at sea for leaking the discovery.

Why it stumps people: The Pythagoreans believed all numbers were ratios of whole numbers. An irrational number shattered their whole worldview. Some historians think the drowning story is myth. The proof, though, is very real, and still taught in first-year number theory classes.

43. The words “algorithm” and “algebra” both trace to one 9th-century Baghdad mathematician. Who? (Medium)

Answer: Muhammad ibn Musa al-Khwarizmi. His Latinized name gave us “algorithm.” His book title al-jabr (meaning “restoration” or “reunion of broken parts”) gave us “algebra.”

Why it stumps people: Two foundational English words from one person working in the House of Wisdom around 820 CE. Most of us say both words daily without thinking about them. He also popularized the decimal system in the Arab world, which then passed to Europe via translations of his work.

How to Use These Questions

Math trivia questions stick best when you miss them first, then see them again a few days later. That’s why LearnClash pairs every wrong answer with spaced repetition: the questions you miss come back at increasing intervals until you’ve truly mastered them, not just skimmed them. Pick a math topic, duel a friend or match with a rival, and let the algorithm handle what comes back and when.

A single round takes 3 minutes and covers 6 topics across 18 questions. You’ll hit math quiz questions alongside whatever else you’ve picked, because knowledge rarely lives in one box. For the learning science behind why this works, our guide to spaced repetition and the testing effect explain why quizzing beats rereading by more than 2x on week-old retention, a finding from Roediger and Karpicke (2006). For ranked math duels, LearnClash uses the ELO rating system, the same one chess players have used since 1960.

Challenge a friend to a math duel on LearnClash →

Want a different flavor next? Try our 43 science trivia questions, 43 history trivia questions, or browse all trivia questions by topic.