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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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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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In 1864, the first barbiturate (barbituric acid) was synthesized.

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Computer programs are available that crosscheck a new drug's possible trade name with all other trade names currently available. These programs detect dangerous similarities between names and alert the manufacturer of the drug.

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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%

Evolutionary adaptation to a new environment via natural selection. Evolutionary adaptation to a new environment via natural selection.
The Environment Influences Gene Expression The Environment Influences Gene Expression
Adults in late adulthood may need to adapt to a new environment as they age and their health status Adults in late adulthood may need to adapt to a new environment as they age and their health status
Age and Grammatical Knowledge The challenge of learning a second language rises with age. Source: J Age and Grammatical Knowledge The challenge of learning a second language rises with age. Source: J
Structures formed by phospholipids in an aqueous environment: Micelle Structures formed by phospholipids in an aqueous environment: Micelle
Selective pressures from the environment influence adaptation Selective pressures from the environment influence adaptation
Video: Origin of organelles Animation

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