It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The longest a person has survived after a heart transplant is 24 years.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
Structure of a typical prokaryotic cell
The egg cell
Cell
A typical large tool box, showing just one of many drawers.
Colored scanning electron micrograph (SEM) of a helper T cell (green) with HIV viruses (red) budding ...
The normal cell cycle and each of its growth phases