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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.

Amphibian development in the wood frog (Rana sylvatica) Amphibian development in the wood frog (Rana sylvatica)
Photograph illustrating the development of a fetus Photograph illustrating the development of a fetus
Development of the Internal Sex Organs Development of the Internal Sex Organs
Wedge-shaped oil film developed below a moving block. Wedge-shaped oil film developed below a moving block.
Tornado Formation: Supercell Tornado Development Tornado Formation: Supercell Tornado Development
Intertropical convergence zone Intertropical convergence zone
Video: Protein digestion - stomach & small intestine

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