SortStack #2895 — 2034-05-13

By duration · Order from shortest to longest.

1. One full rotation of the London Eye 30 min

   It moves so slowly — about 0.9 km/h — that it usually doesn't stop to let passengers on; you simply step into the moving capsule.

2. The average adult's actual night of sleep 6.8 h

   Smartphone-tracking studies put the global average well under the recommended eight hours — and humans sleep less than virtually any other primate.

3. Rio de Janeiro's Carnival, official festival period 5 days

   Around two million people hit the streets per day, and the samba school parade is a fierce contest judged on dozens of criteria.

4. The Islamic holy month of Ramadan 29.5 days

   Because it follows the lunar calendar, Ramadan drifts about 11 days earlier each year — cycling through every season over 33 years.

5. A horse's pregnancy 340 days

   Foals can stand within an hour of birth and gallop within a day — a survival feature for a prey animal born on open grassland.

6. A frilled shark's pregnancy 3.5 years

   At an estimated three and a half years, it's the longest known gestation of any vertebrate — embryos grow just over a centimetre a month.

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