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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
The longest a person has survived after a heart transplant is 24 years.
It is difficult to obtain enough calcium without consuming milk or other dairy foods.
Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.
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.

