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There are 20 feet of blood vessels in each square inch of human skin.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.
Always store hazardous household chemicals in their original containers out of reach of children. These include bleach, paint, strippers and products containing turpentine, garden chemicals, oven cleaners, fondue fuels, nail polish, and nail polish remover.
There are 60,000 miles of blood vessels in every adult human.