11 Surprising Mysteries Scientists Can’t Explain.
It seems that scientists have already studied everything on our planet, but this is not the case.
buzz russia has collected 11 awesome puzzles that have no logical explanation yet.
1 How do cats purr?
Cats purr when they are happy, but no one knows how. When they purr, you can’t even hear their heartbeat!
Scientists say that cats make vibrating sounds with their vocal chords.
Their frequency speeds up healing and reduces pain, which is why cats purr when they are stressed or hurt.
