After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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Thyroid conditions may make getting pregnant impossible.
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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
Examples of cell types derived from ectoderm, mesoderm, and endoderm.