Red blood cells have a funny shape: a flattened center, somewhat resembling a donut without its hole completely pierced. This is called a biconcave shape...
Leonardo da Vinci had a very curious mind; he was interested in everything related to living beings, and he was particularly fascinated by the human...
In some frogs, nocturnal fluorescence comes from particular molecules located beneath their skin. These compounds absorb ultraviolet (UV) light and then re-emit that energy in...
About 540 million years ago, during the Cambrian period, the first marine mollusks developed calcium carbonate shells. Initially, these shells primarily served to provide mechanical...
This behavior in squirrels is primarily related to their need to assess and secure a specific area before digging. They circle around to better inspect...
Mimicry allows an animal or plant to resemble something else—sometimes a dangerous or toxic species, sometimes simply its environment—and effectively deceives predators. When a predator...
The legs of spiders have a very special anatomy: at their tips, there is a multitude of tiny microscopic hairs called setae, which help them...
Darwin spent nearly twenty years observing, recording, and rechecking his hypotheses on evolution. He wanted to be certain before publishing, in order to avoid gross...
Milk is primarily composed of water, but it also contains proteins, lipids (that is, fats), lactose (a type of sugar), and vitamins. The lactose serves...
Pheromones are small and lightweight chemical molecules. This allows them to diffuse quickly and easily in the air, even over long distances. Their structures are...
