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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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.
People about to have surgery must tell their health care providers about all supplements they take.
Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.