SortStack #2027 — 2031-12-27

By duration · Order from shortest to longest.

1. One full revolution of a helicopter's main rotor 150 ms

   Main rotors spin at only a few hundred rpm, but the blade tips travel so fast they approach the speed of sound — the source of that thudding chop.

2. Usain Bolt's 100 m world record run 9.6 sec

   Bolt ran 9.58 in Berlin 2009, hitting a top speed of 44.7 km/h — faster than the speed limit on many city streets.

3. The men's 100 m freestyle world record swim 46.4 sec

   Pan Zhanle's 46.40 at Paris 2024 stunned the field — he won by over a second, an eternity in a sprint event decided by fingernails.

4. A Eurostar train journey from London to Paris 2.3 h

   Only about 20 minutes of the trip is actually under the sea — the Channel Tunnel remains the longest undersea rail tunnel in the world.

5. The Apollo 13 mission, launch to splashdown 6 days

   After the oxygen tank exploded, the crew used the lunar module as a lifeboat and slingshotted around the Moon — NASA's 'successful failure'.

6. The time since Neanderthals went extinct 39.9K years

   They never fully vanished: most people outside Africa carry around 2% Neanderthal DNA, influencing skin, immunity, and even sleep patterns.

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