SortStack #3147 — 2035-01-20

By duration · Order from shortest to longest.

1. An average human yawn 6 sec

   Yawns are so contagious they jump species: dogs catch yawns from their owners, and even reading the word can trigger one. You're welcome.

2. An average swim across the English Channel 13.5 h

   Fewer people have swum the Channel than have climbed Everest — and rules forbid wetsuits, allowing only goggles, a cap, and grease.

3. A chicken egg's incubation, laying to hatching 21 days

   Chicks start cheeping to their mother through the shell a day or two before hatching — and she clucks back to encourage them out.

4. An African elephant's pregnancy 1.8 years

   The longest gestation of any land mammal produces a 100 kg calf that can walk within hours — and is looked after by the whole herd.

5. The first circumnavigation of the globe (Magellan's expedition) 3 years

   Magellan himself never made it — he was killed in the Philippines. Just 18 of the original ~270 crew limped home aboard one remaining ship.

6. The time since a human last stood on the Moon 53.4 years

   Gene Cernan traced his daughter's initials in the dust in December 1972 — no boots have touched the surface since.

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