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

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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.

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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.

A fossil leaf in low-grade coal A fossil leaf in low-grade coal
These young children are taking the initiative to explore their environment as they examine a snail These young children are taking the initiative to explore their environment as they examine a snail
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
Human Activities and the Environment Human Activities and the Environment
Producer acquiring energy and nutrients from the environment Producer acquiring energy and nutrients from the environment
Video: Optic Nerve and Optic Disk Animation (Part 2 of 2)

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