1 – Optical Illusions
You don’t always see what you think you see, because of the way your brain and eyes work together to perceive and interpret images. How is the mind so easily fooled by optical illusions? The brain creates an image from information sent from your sensors in your eyes that measure curvature, light, and shade, etc. Where your optic nerve and retina meet, there are no sensors. This causes what we call blind spots, and also creates the illusion of steady vision. Whatever the illusion is created, we rely on our brain to interpret what we see logically. In other words, your perception of the illusion has more to do with your brain than the optics of your eyes.
2 – Red Blood Cells
While you might assume that the red color of your blood is a result the iron in your blood, the iron has nothing to do with it. The red color is caused by a ring of atoms called porphyrin and the whether
oxygen is present. The presence of oxygen changes the shape of the porphyrin and that in turn gives the blood cells its red color.
3 – Bacterial Life
Going by a count of cells, did you know that there are more bacterial cells in your body than human cells? In fact there are ten times the number of bacterial cell. The vast majority of these are not only not harmful, but in fact beneficial. You might be able to live without bacteria, but you would need a very restrictive and nutrient packed diet to re-compensate for the lack of digestive enzymes that beneficial bacteria creates.
4 – Goosebumps
Have you noticed that when animals are threatened or cold they fluff up their fur to appear larger or to provide better insulation? Goosebumps are an evolutionary remnant of that process. Small muscles that surround your hair follicles tense up and make your hair stand on end.
5 – Appendix
Previously our appendix was considered a no longer useful part of your body that will sometimes become infected and has to be removed. However, recent studies have found that it actually stores beneficial bacteria useful in the digestive process.
6 – Loss of Fur
Did you know that humans actually have the same amount of hair follicles as a Chimpanzee? Ours, however, is much finer of course. Why are humans not covered in fur as most other mammals? Scientists have many theories, some which suggest that it may be that early humans were at least partly aquatic, or to make it more difficult for parasites.