Bats are not blind and can in fact see quite well using their eyes. While most bats do have advanced ears that give them a form of vision in the dark known as echolocation, these good ears does not require them to have bad eyes. Bats use their good hearing

From one point of view, the original cell you came from (the fertilized egg cell) was destroyed long before your body was formed. From another point of view, every cell in your body is the original. In either case, there is not just one original cell sitting in your elbow

Birds do not have teeth. Without teeth, a bird cannot chew its food down to bits in its mouth like humans do. As detailed in the textbook Ornithology by Frank B. Gill, birds must instead rely on the muscular stomach-like pouch called the gizzard to crush down their food. Many

Humans have never stopped evolving and continue to do so today. Evolution is a slow process that takes many generations of reproduction to become evident. Because humans take so long to reproduce, it takes hundreds to thousands of years for changes in humans to become evident. We simply don't notice

No chemicals can make human tissue regenerate in seconds. Biological tissue is composed mainly of a large collection of cells sitting in a scaffolding of proteins and sugar chains (the extracellular matrix) and bathed in fluids that carry various chemicals between the cells. The regeneration of tissue mainly involves the

No, ionizing radiation is only harmful to an organism as a whole when its amount gets too high. We are constantly bombarded with very small amounts of ionizing radiation that occur naturally, and we get along just fine with our lives without being seriously harmed by this radiation. There are

Yes, human blood is green in the deep ocean. We have to be careful about what we mean by color. Objects don't really have an intrinsic color. Rather, the color of an object is determined by three factors: 1) the color content of the incident light that is illuminating the

The outer layer of skin cells on your finger does not detect anything. The outer layer of your skin contains cells that are dead. In fact, the outermost 25 to 30 cell layers of your skin consist of dead cells that do nothing beyond providing a physical barrier that keeps

Doctors did not create your belly button (or navel). The navel is not the scar or knot left by a doctor that cut your umbilical cord at birth. This fact is obvious to anyone that has ever had children or bathed newborns, but it is sometimes misunderstood by others. While

Healthy humans use all of their brain. There is no part of the brain that goes unused. Certain tasks work certain parts of the brain more, but they all play important roles, as explained by neurobiologist Dr. Eric Chudler. Brain maps, as found in modern anatomy books, indicate that each