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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.