17. Human fingers can feel objects as small as 13 nanometers. “This means that, if your finger was the size of the Earth, you could feel the difference between houses from cars.”
18. In addition to the well-known 5 human senses, humans have 15 “other senses” that include things like balance and acceleration, temperature, pain, time, as well as internal senses for suffocation, thirst, and fullness.
20. Humans are just about the best endurance runners in the animal kingdom, including horses, and only get better the longer the distance. Early humans literally used run their prey to exhaustion and death.