SortStack #1071 — 2029-05-15

By weight · Order from lightest to heaviest.

1. A single drop of water 50 mg

   Pharmacists standardized the 'drop' centuries ago: twenty drops make roughly one milliliter.

2. An adult human brain 1.4 kg

   It is about 2% of your body weight yet burns roughly 20% of your energy — mostly just keeping billions of neurons ready to fire.

3. An average adult domestic cat 4.2 kg

   Cats purr at frequencies between 25 and 150 Hz — a range some studies suggest can promote bone and tissue healing.

4. A standard Good Delivery gold bar, the kind in bank vaults 12.4 kg

   Smaller than a brick yet heavier than most pet dogs — gold is so dense this bar would fit in a shoebox with room to spare.

5. An adult male African lion 190 kg

   A lion's roar can be heard up to 8 km away, thanks to uniquely flat, square-shaped vocal folds.

6. An adult male African bush elephant 6 t

   The largest land animal walks almost silently — its foot pads expand and absorb sound like cushioned trainers.

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