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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.

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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

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The human body produces and destroys 15 million blood cells every second.

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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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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.

A theoretical photosynthetic response curve. A theoretical photosynthetic response curve.
How alcohol affects you body How alcohol affects you body
The oxygen sensor provides a quick response at the stoichiometric air–fuel ratio of 14.7:1. The oxygen sensor provides a quick response at the stoichiometric air–fuel ratio of 14.7:1.
The major cortical input and output pathways of the posterior parietal association cortex. Shown are ... The major cortical input and output pathways of the posterior parietal association cortex. Shown are ...
Localizing the Source of High-Frequency Sounds Localizing the Source of High-Frequency Sounds
Dose-response curve with threshold Dose-response curve with threshold
Video: Deafness Culture

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