Just know.

12 facts — science, space, the body, the world. No fluff.
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What is the longest word?

The chemical name of titin, a muscle protein, is 189,819 letters — unusable even by chemists. "Pneumonoultramicroscopicsilicovolcanoconiosis" (45 letters) is the longest word in major dictionaries.

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What was the shortest war in history?

The Anglo-Zanzibar War of 1896 lasted roughly 38 minutes between the ultimatum's expiry and the sultan's palace falling.

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What is the least-used punctuation mark?

The interrobang (‽) — a question mark fused with an exclamation point. It does exactly what it looks like it does.

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What is the Oxford comma?

The comma before "and" in a list: "red, white, and blue". Its absence famously decided a US labor lawsuit costing a dairy company $5 million.

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Why do old books smell good?

Paper breaks down and releases volatile organic compounds — traces of vanilla, almond and grass. Librarians literally smell-test books for degradation.

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How many chess games are possible?

More than the number of atoms in the observable universe — the Shannon number estimates 10^120 distinct games. And that's before promotions.

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What is opposite six on a die?

One — Western dice are manufactured so opposite faces always sum to seven: 1-6, 2-5, 3-4.

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Why do we count eggs in dozens?

Twelve divides cleanly by 2, 3, 4 and 6, making ancient trade easier. The Babylonians counted in base 60 for the same reason — which is why clocks have 60 minutes.

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Where did the McDonald's golden arches come from?

Architect Richard McDonald designed them in 1953 as glowing yellow parabolas; designer Louis Cheskin kept them because they resemble a certain pair of maternal anatomy — "Freudian symbolism" he admitted.

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Does the moon have quakes?

Yes — moonquakes, some up to magnitude 5.5, triggered by tidal stresses and thermal expansion. The Moon rings like a bell for far longer than Earth does.

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Why do sea otters hold hands?

To keep the group from drifting apart while napping — and mothers wrap pups in kelp "anchors". Rafts can number over a thousand otters.

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Do cows have best friends?

Studies show cows form preferred companions and get measurably stressed when separated — heart rates spike and they pace until reunited.