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!
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.
Hi my first time posting here. Did you know that on May 6, 2021, some tardigrades (better known as water bears) were sent to the International Space Station to see how they adapted To microgravity
