SortStack #2881 — 2034-04-29

By duration · Order from shortest to longest.

1. A single wingbeat of a hovering hummingbird 12.6 ms

   Up to 80 wingbeats per second lets hummingbirds hover, fly backwards, and even fly upside down — no other bird can do all three.

2. 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.

3. A typical national anthem performance at a sports event 1.5 min

   Uruguay's full anthem runs about five minutes, while Japan's 'Kimigayo' has just four lines — the shortest lyrics of any anthem on Earth.

4. Randy Gardner's world record for staying awake 11 days

   The 17-year-old's 1964 science-fair stunt of 11 sleepless days still stands — Guinness stopped certifying attempts as too dangerous.

5. 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.

6. Ancient Egyptian civilization, from unification to Cleopatra 3.1K years

   It ran so long that Cleopatra lived closer in time to the Moon landing than to the building of the Great Pyramid.

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