The unsightly yellowish residue with which we wake up every morning comes from the mucosa and various glands , such as Zeiss -sebaceous-, Moll -sudoríparas-, Meibomio -which generate fatty substance to lubricate the eyelid- and tear glands. Its secretions drag particles to the edge of the eyelids or the corners of the eye openings. What does not evaporate turns into legaña.
What is a legaña made of?
Did you know that eyes are an example of evolution?
According to followers of intelligent design, the eye is an example of irreducible complexity, but the reality is very different.
Morris syndrome: women with testicles
Nature likes diversity, and in humans, sex is far from being the binary variable that many believe it to be.
The most horrendous side of the human being
The social sciences have shown with a series of experiments the most horrendous, primitive and sickly side of human nature.
Discover the life that hides under your nails
Our body has as many microorganisms as cells, and some hide in the most remote places.
They find the oldest heart in history (it is 380 million years old)
The fossil corresponds to an ancient jawed fish. Its structure sheds light on the evolution of the human body.