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Shattered tears


In the late 17th century CE, Prince Rupert’s drops were some of the most confusing objects known to science: an extremely tough glass teardrop that will disintegrate if its tail is even slightly damaged.

Saltiest ponds

Don Juan Pond

We’ve all heard of the Dead Sea, so salty that people naturally float in it. But the Gaet’ale Pond in Ethiopia is saltier, and the Don Juan Pond in Antarctica is so salty that it doesn’t freeze, even at -50°C.

Impossible colours

Impossible colours

Through some tricks of the human eye, we can see colours outside of the normal visual range: Stygian, self-luminous, and hyperbolic colours, and perhaps even combinations like redgreen. These are the impossible colours.