SortStack #2099 — 2032-03-08

By size · Order from shortest to longest.

1. The width of a human hair 0.1 mm

   Hair width is so consistent it was once a unit of precision; forensic labs still match hairs to within fractions of this.

2. A golf ball 4.3 cm

   A golf ball has 300 to 500 dimples; they cut drag and roughly double how far a struck ball will fly.

3. A red kangaroo (standing) 1.5 m

   Kangaroos cannot walk backwards, a trait so iconic it earned them a spot on Australia's coat of arms.

4. The CN Tower, Toronto 553 m

   Its glass floor can hold the weight of dozens of moose, yet many visitors still cannot bear to step on it.

5. The Millau Viaduct, France 2.5 km

   The tallest bridge in the world, its deck sometimes sits above the clouds that fill the valley below.

6. The Trans-Siberian Railway (length) 9.3K km

   The longest railway on Earth, a single trip from Moscow to Vladivostok takes about seven days without stopping.

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