This Young Woman’s Extraordinary Pregnancy Only Happens Once Every 500 Years

The More You Know

• Tears contain a natural painkiller, which reduces pain and improves your mood.
• There are around 60,000 miles of blood vessels in the human body. If you took them all out and laid them end to end, they’d stretch around the world more than twice.
• Water makes different pouring sounds depending on its temperature.
• The world's most toxic mineral is cinnabar.