Secret experiments by a 16th-century alchemist involved an element that nobody knew about at the time

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Tycho Brahe in a portrait with an oval around it
Tycho Brahe, a 16th-century astronomer and alchemist, had tungsten in his lab nearly 200 years before scientists knew what it was.

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A rare manuscript about eclipses just sold for $255,000 at auction. Its author was the man who discovered the most famous comet.

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Engraving of astronomer Edmond Halley with curly shoulder-length hair and a dark jacket
Edmond Halley was an inventive astronomer who is best known for discovering the periodic return of the comet that's named for him.

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