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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.

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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.

Killer Whale - Size comparison to an average human. Killer Whale - Size comparison to an average human.
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Schematic map of the human mitochondrial genome. Schematic map of the human mitochondrial genome.
Estimated times of divergence of human and Neanderthal genomic Estimated times of divergence of human and Neanderthal genomic
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Video: The life cycle of protein

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