If you were to lay out all the blood vessels in the human body end to end, they would stretch over 60,000 miles. That's enough to circle the Earth more than twice!
In 1518, a Town Danced Itself to Death
The Dancing Plague of 1518 struck Strasbourg, France, where hundreds of people danced uncontrollably for days without stopping. Some died from exhaustion and heart failure. Historians believe it was caused by mass
The Mongols Created the First International Postal System
Genghis Khan established the Yam (postal system), which allowed for fast, reliable communication across the vast Mongol Empire. Riders could travel 200 miles per day using relay stations.
Sweat is like a fingerprint. Its composition is a combination of compounds that is uniquely yours. So while everyone sweats, no two people sweat the same.
