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Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.

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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

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According to animal studies, the typical American diet is damaging to the liver and may result in allergies, low energy, digestive problems, and a lack of ability to detoxify harmful substances.

Primary production increases with an increase in total phosphorus concentration. Primary production increases with an increase in total phosphorus concentration.
Motile sperm cells of algae and seedless plants. Motile sperm cells of algae and seedless plants.
Global Coffee Production Global Coffee Production
How the cortical reaction in a mouse egg is thought to prevent additional sperm from entering the eg How the cortical reaction in a mouse egg is thought to prevent additional sperm from entering the eg
Satellite data showing net primary production. Productivity is coded as red (highest) down through o Satellite data showing net primary production. Productivity is coded as red (highest) down through o
Animated Changes in the ovary and uterus correlated with changing hormone levels. We start with the Animated Changes in the ovary and uterus correlated with changing hormone levels. We start with the
Video: How eudicots (true dicots) differ from monocots Animation

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