Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.
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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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.
Photograph of a brain specimen with a large malignant tumor.
brain
Blood-brain barrier
Compared with modern humans, Homo erectus has a larger face, lacks a chin and canine fossa, and has