SortStack #3254 — 2035-05-07

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. An acoustic guitar 99 cm

   The guitar's hollow body acts as an amplifier, resonating the strings' vibration into the air around it.

3. A giant sequoia (tallest) 89 m

   These trees can live over 3,000 years, and their thick bark resists fire that clears competing plants away.

4. The cruising altitude of Concorde 18 km

   Concorde flew so high that passengers could see the curvature of the Earth and the dark of space above.

5. The Kiel Canal, Germany 98 km

   The world's busiest artificial waterway, it lets ships skip the long, stormy voyage around Denmark.

6. Great Britain, Land's End to John o' Groats 970 km

   The classic end-to-end journey covers roughly 1,400 kilometres by road, a favourite challenge for cyclists and walkers.

← All puzzles · Play today’s SortStack