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Did you know?

The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.

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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.

General structure of an animal cell General structure of an animal cell
Activated Natural Killer Cell (NK Cell) Activated Natural Killer Cell (NK Cell)
Power in the United States: The Model Proposed by C. Wright Mills Power in the United States: The Model Proposed by C. Wright Mills
Positive and negative selection during T-cell development. Positive and negative selection during T-cell development.
Plant cell structure Plant cell structure
Light-independent reactions in C4 plants Light-independent reactions in C4 plants
Video: Protein digestion - stomach & small intestine

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