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Largest ocean current

Southern Ocean

How do you measure ocean flow? One sverdrup equals a million cubic metres of water per second. All of the world’s rivers emptying into the ocean is 1.2 sverdrups; the largest current in the world is more than a hundred times larger.

Shattered tears

Drops

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.