Spider veins are tiny, thin veins that can be seen very close to the skinâs surface. They look like red, blue, or green spider webs just beneath the skin. Sometimes they are also described as looking like marble. Spider veins are caused by a backup of blood. These become nonfunctional, âdead-endâ veins.
While the fairy fly is the worldâs smallest insect, there a few runners up! For example, the feather wing beetle is only .25 millimeters long. Some scientists think these beetles may even be smaller than fairy flies, but for now, the fairy fly is considered by many to be the âsmallest insect!â.
We hear a lot about the fastest things on Earth, the peregrine falcons, sailfish and cheetahs of this world. But what are the slowest? Earth Unpluggedâs Maddie Moate discovers that animals that live life in the slow lane, like tortoises, sloths and garden snails, are the masters of survival. But they are positively speedy; there are much slower things to be found on our planet. For more videos subscribe to the Earth Unplugged channel on YouTube.