The Sherpa advantage on Mount Everest is not just more bl... | funfact.wiki | funfact.wiki
The Sherpa advantage on Mount Everest is not just more blood. Many people adapt to altitude by making extra red cells, but Sherpas can have lower hemoglobin while their muscle mitochondria use oxygen more efficiently — a result of long evolution.
Menthol makes your mouth feel cool without changing the actual temperature. It raises the activation threshold of cold receptors, making you perceive coldness at temperatures that would not normally trigger it.
A camel's hump stores fat, not water — and evolved for the Arctic, not the desert. 3.5 million years ago, ancestors in Arctic Canada grew fat-storing humps to survive winters. When they migrated south, the hump proved equally useful in the desert.
In 1980s Australia, male beetles were found mating with beer bottles. The brown color, size, and bumps on the bottles mimicked female beetles, acting as a "supernormal stimulus." When this threatened the species, Australian breweries redesigned their bottles, removing the bumps.