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Did you know?

Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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Asthma-like symptoms were first recorded about 3,500 years ago in Egypt. The first manuscript specifically written about asthma was in the year 1190, describing a condition characterized by sudden breathlessness. The treatments listed in this manuscript include chicken soup, herbs, and sexual abstinence.

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Aspirin may benefit 11 different cancers, including those of the colon, pancreas, lungs, prostate, breasts, and leukemia.

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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

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Maslow's hierarchy of needs Maslow's hierarchy of needs
Maslow and Self-Actualization Maslow and Self-Actualization
Hierarchy of scientific evidence Hierarchy of scientific evidence
The hierarchy of genes involved in establishing the segmented body plan in Drosophila The hierarchy of genes involved in establishing the segmented body plan in Drosophila
Hierarchy of physics Hierarchy of physics
Video: Atrophy

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