Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
Did you know?
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.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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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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The horizontal fraction bar was introduced by the Arabs.
Animal extinctions and human population growth.
A recombination-based map of one of the chromosomes of Drosophila
Growth and Development
Human population growth, 1700 - present
Natural Resource Prices, 1850–2010
Other Endocrine Tissues and Organs, Eicosanoids, and Growth Factors