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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.

Obsolete feet

Foot

Prior to standardization, the measurement of length designated “the foot” was a different size depending on which country or region you were in. Notable variants included the Prussian foot, the Rijnland foot (which became the Cape foot used in South Africa), and the Chinese mathematician’s foot.