Human BodyHeart
You make two million red blood cells every second.
Reading this sentence cost you about ten million, and they are already replaced.
Source
This fact is written from the English Wikipedia article it links to, so you can check every word in one tap. Fact Drop rates that source 4 out of 5 for credibility, and the rating travels with the fact on the back of its card in the app.
More human body facts
Human body facts about the one you are sitting in. Roughly 8% of your DNA came from ancient viruses, you almost certainly have mites living on your face, and a newborn can breathe and swallow at the same time. Every fact links to the reference behind it.
- Across mammals, a lifetime works out at roughly a billion heartbeats whether you are a shrew or an elephant.
- Your heart contains its own small nervous system — tens of thousands of neurons that keep it beating and adjusting after every nerve from the brain has been cut.
- Your blood vessels would wrap around the planet twice.
- Deoxygenated blood is dark red, never blue.
- Roughly 8% of human DNA came from ancient viruses.
- Cells cross the placenta in both directions during pregnancy.