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Pacific aurora

In 1962 the United States detonated a nuclear bomb in outer space over Hawai’i. It caused an artificial aurora in the sky over Honolulu – and another one over Samoa, more than four thousand kilometres away.

Weirdest shark

The cookiecutter shark is easily the weirdest shark around: it uses bioluminescence to lure large predators, feeds by suction, sheds whole rows of teeth at once and swallows them, and by weight can be more than one third liver.