SortStack #979 — 2029-02-12

By size · Order from shortest to longest.

1. A human red blood cell 8 µm

   Your body makes around 2 million of them every second to replace the ones that wear out after roughly 120 days.

2. A single poppy seed 1.3 mm

   It takes roughly 3,000 poppy seeds to make a single gram, which is why they scatter so easily off a bagel.

3. A tennis ball 6.7 cm

   Tennis balls are pressurised with gas and slowly go flat, which is why fresh cans hiss when opened.

4. A standard house brick 22.5 cm

   Fired clay bricks have been made the same basic way for over 5,000 years, outlasting the empires that baked them.

5. The Brooklyn Bridge (total length) 1.8 km

   When it opened in 1883, a stampede fearing collapse killed twelve people; a circus later marched elephants across to prove its strength.

6. The River Danube (length) 2.9K km

   It flows through more countries than any other river in the world, passing four national capitals on its way.

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