SortStack #594 — 2028-01-24

By size · Order from shortest to longest.

1. A tennis ball 6.7 cm

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

2. 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.

3. A Boeing 737 airliner 34 m

   The 737 is the best-selling jet airliner in history, with one taking off somewhere on Earth every few seconds.

4. Mount Kilimanjaro, Tanzania 5.9 km

   You can walk from tropical jungle to arctic glaciers on its slopes, passing through five climate zones in days.

5. The Mariana Trench (depth) 11 km

   If Everest were dropped into it, the peak would still sit more than two kilometres below the surface.

6. The Panama Canal 85 km

   Ships are lifted 26 metres above sea level by locks, then lowered again, crossing a continent without touching the ocean between.

← All puzzles · Play today’s SortStack