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Relative humidity isn't what you think it is

This episode is brought to you by the Music for Scientists album! Have you ever wondered why 75% humidity in the summer feels ...

An Infamous Climber Made History With a Death-Defying Ropeless Summit. Now He’s on to Something Far More Perplexing.

The guy from Free Solo is about to climb one of the world’s tallest buildings. Is that foolish?