Ginger has been clinically demonstrated to work twice as well as dramamine for fighting motion sickness, with no side effects. Although it doesn't prevent colds, Vitamin C works as an antihistamine, without side effects if it's buffered. It also helps to avoid the precise sort of emotional stress that brings them on, if you can identify it. It works by substituting for arginine when the virus is constructing proteins, which then don't work. Stay away from the latter when you're stressed.
Human sperm comes in three varieties, mixed.
Some drive toward the egg, the other two exist only to kill, or to obstruct, other men's sperm. The relative proportions found in semen depends on the man's belief at the time of ejaculation about whether his are the only sperm there. This says a lot about our evolutionary past. Each cell in your body contains symbiotic bacteria called mitochondria, which have their own DNA and reproduce by themselves. All your mitochondria came from your mother.