Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
Enamel is hardest substance in the human body.
61
We forget why we have entered a room because passing through doors creates an ‘event boundary’ causing the brain to file away what we were just thinking about.
26
Only humans shed emotional tears.
331
Early American humans hunted car-size armadillos and used their shells for houses.
12
A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
23
Tigers can see 6 times better at night than humans.
305
One human hair can support 3 ounces.
191