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Did you know?

Looking at the sun may not only cause headache and distort your vision temporarily, but it can also cause permanent eye damage. Any exposure to sunlight adds to the cumulative effects of ultraviolet (UV) radiation on your eyes. UV exposure has been linked to eye disorders such as macular degeneration, solar retinitis, and corneal dystrophies.

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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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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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People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.

Lampreys (sometimes also called lamprey eels) are a family of jawless fish Lampreys (sometimes also called lamprey eels) are a family of jawless fish
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Cerebral angiography. The four angiograms each reveal the distribution of blood vessels supplying th Cerebral angiography. The four angiograms each reveal the distribution of blood vessels supplying th
James A. Garfield lies mortally wounded. After failing to locate the bullet, surgeons called in Alex James A. Garfield lies mortally wounded. After failing to locate the bullet, surgeons called in Alex
Cutaway Drawing of Tholos, The So-called Treasury of Atreus Cutaway Drawing of Tholos, The So-called Treasury of Atreus
A nerve cell (neuron) has extensions called dendrites A nerve cell (neuron) has extensions called dendrites
Video: ADH and the arterioles, kidneys, sweat glands and the Atrial natriuretic peptide (ANP)

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