Science is our route to understanding the world around us -- but sometimes, even the sharpest minds need a while to explain the weirdest discoveries. Here are ten amazing findings that remain unexplained by science.
From mysterious noises from the deep, through strange contraptions designed to model the movement of the planets, to the well-known but poorly understood placebo effect, these 10 discoveries are very real but remain unexplained. When might they be cracked? [YouTube]