Friday, June 12 — Day 20

Last day of the year. No drill. Today is just the cool stuff — random facts across everything you've studied. Read them. Tell someone at lunch.

The deal today

9:30 to 11:00 school — 90 minutes, mostly reading these.
11:00 to 12:00 — no phone. Outside, food, nothing. Your hour.
There's a short, optional 18-question victory lap at the bottom if you want it. No pressure today.

The timeline of everything

Squeeze all 13.8 billion years into one calendar year. Big Bang is midnight on January 1. The Sun and Earth don't form until early September. The dinosaurs die on December 26. All of recorded human history — pyramids, Rome, the internet — fits in the last ~30 seconds before midnight on December 31.
Sharks are older than trees. Sharks have been around ~450 million years; the first real trees, ~390 million. Sharks also predate Saturn's rings.
T. rex is closer in time to you than to Stegosaurus. T. rex lived ~66 mya, Stegosaurus ~150 mya. The gap between them is bigger than the gap between T. rex and us.
For most of Earth's history, life was nothing but single cells. Big, complex animals are a late, sudden arrival — the Cambrian explosion (~540 mya) produced most major animal groups in a geological blink.

The periodic table has a wild backstory

Mendeleev left blank squares. In 1869 he arranged the known elements and, where the pattern had a hole, predicted an unknown element and its properties. Gallium and germanium were later found exactly as he described. The table predicted its own missing pieces.
Helium was found in the Sun before it was found on Earth. Astronomers spotted its fingerprint in sunlight in 1868 and named it after Helios, the Greek sun god.
Phosphorus was discovered in urine. In 1669 an alchemist boiled down vats of it hunting for gold and got a glowing white substance instead.
You are made of stardust — literally. The carbon in your cells and the oxygen you breathe were forged inside stars. The gold in a ring was made in an exploding star or a collision of neutron stars.
Hydrogen is ~75% of all the normal matter in the universe. The lightest element is also the most common.
Trivia: the only letter not on the periodic table is J.

Peace, the strange stories behind the dates

Westphalia (1648) is often called the birthday of the country — the idea that a state rules its own land and no one outside gets to interfere started here.
Versailles (1919) was signed in the Hall of Mirrors, and its terms were so crushing that historians point to it as a direct cause of WWII. The peace that started the next war.
Korea never signed peace. The 1953 deal was an armistice — a cease-fire. Technically the two Koreas are still at war today.
Oslo (1993) was negotiated in total secret in Norway; the world only found out at the famous White House handshake.
Good Friday (1998) ended 30 years of bombings in Northern Ireland and was approved by the public in a vote on both sides of the border.

A couple of number tricks

12 × 12 = 144, and 144 has a name: a gross.
Multiply any two-digit number by 11 by splitting it and adding the middle: 11 × 24 → 2 (2+4) 4 → 264.
A googol is 1 followed by 100 zeros — bigger than the number of atoms in the observable universe (about 10⁸⁰). The company spelled it wrong on purpose.

Last word

Five weeks. You ran the exams yourself, found a real bug we fixed, and got faster every week. The scores were never the point — that you showed up, alone, every morning, was. We'll send the numbers after today. Enjoy the last one.

Optional victory lap (18 questions)

Only if you feel like it — the cool stuff, lightly: the deep-time timeline, a few elements, a few treaties, a couple of quick numbers.

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