SortStack #1820 — 2031-06-03

By weight · Order from lightest to heaviest.

1. The Hope Diamond 9.1 g

   The famous blue gem glows an eerie red-orange for minutes after exposure to ultraviolet light — a quirk of trace boron inside.

2. A kiwi fruit 75 g

   Originally China's 'mihoutao', it was rebranded by New Zealand exporters in 1959 after their flightless national bird.

3. A liter of water 1 kg

   The kilogram was originally defined in the 1790s as the mass of exactly this much water — the tie was only fully broken in 2019.

4. An adult male grizzly bear 270 kg

   Before hibernation a grizzly can pack on more than a kilogram of fat per day, entering the den far heavier than in spring.

5. A Space Shuttle orbiter, empty on the runway 78 t

   Returning from orbit, the shuttle was a glider with no engines for a second try — every landing had to work the first time.

6. A Nimitz-class aircraft carrier 100K t

   A floating city of about 5,000 people, it can sail more than 20 years between refuelings of its nuclear reactors.

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