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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
Hypertension is a silent killer because it is deadly and has no significant early symptoms. The danger from hypertension is the extra load on the heart, which can lead to hypertensive heart disease and kidney damage. This occurs without any major symptoms until the high blood pressure becomes extreme. Regular blood pressure checks are an important method of catching hypertension before it can kill you.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.