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Did you know?

When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).

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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

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The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.

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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.

Three days after the Boston Marathon explosion, the FBI released this photograph that had been taken Three days after the Boston Marathon explosion, the FBI released this photograph that had been taken
The conduction system of the heart. The conduction system of the heart.
The digestive system. The digestive system.
The calibration module on many Ford computers contains a system PROM. The calibration module on many Ford computers contains a system PROM.
A hole in the exhaust system can cause outside air (containing oxygen) to be drawn into the exhaust ... A hole in the exhaust system can cause outside air (containing oxygen) to be drawn into the exhaust ...
Female Reproductive System - Mature (graafian) follicle "الجهاز التناسلي ... Female Reproductive System - Mature (graafian) follicle "الجهاز التناسلي ...
Video: Chemical Messengers Animation

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