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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
There are 60,000 miles of blood vessels in every adult human.
IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.
In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.