The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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Studies show that systolic blood pressure can be significantly lowered by taking statins. In fact, the higher the patient's baseline blood pressure, the greater the effect of statins on his or her blood pressure.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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The average adult has about 21 square feet of skin.
five week embryo
Three views of neurulation in an amphibian embryo
Cleavage: Micas
Human embryo at successive stages of development (not to scale).
