Sound moves faster in water…? We may need fish to get us to Mars…? There was a robot in the 15th century…? Here are fun facts about science… WATCH OUR OTHER VIDEOS: ►25 Shocking Scientific Predictions ...

Laid end to end, an adult's blood vessels could circle Earth's equator four times, with scientists estimating anywhere between 60,000-100,000 miles of blood vessels in the human body. Your heart ...