11 Surprising Mysteries Scientists Can’t Explain

It seems scientists have already studied everything on our planet, but that’s not the case.

inspiral viral collected 11 fascinating mysteries that have no rational explanation yet.

How do cats purr?

Cats purr when they feel happy, but no one knows how. When they purr, you don’t even hear their heart beating!

Scientists say cats make the vibrating sound with their vocal chords. Its frequency accelerates healing and reduces pain, which is why cats purr when they are stressed or hurt.

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