It looks like a covering and behaves like a factory. Here are seventeen jobs.
1. Replacing Its Own Outer Layer Continuously
Cells are produced at the base of the outer…
Most explanations of bruising stop at the first sentence: a knock breaks small blood vessels under the skin, blood escapes into the tissue, and you can see it. That is…
Almost everybody has experienced this, and almost nobody has considered how strange it is.
Sitting still in a vehicle, entirely uninjured, having eaten nothing unusual, a person becomes progressively unwell…
Blood Types Were Discovered Over a Century Ago and Nobody Has Established What They Are Actually For
Most people know their blood type, treat it as a fixed personal fact like eye colour, and have never wondered what it is.
It is a molecule. Specifically, blood type…
There is a particular quiet inside an old forest that younger woodland does not have. Fallen trunks decay where they land, moss covers everything, the canopy closes overhead, and the…
Life expectancy — the average number of years a person born today can expect to live — is one of the most revealing statistics about a country, reflecting its healthcare,…