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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
Methicillin-resistant Staphylococcus aureus or MRSA was discovered in 1961 in the United Kingdom. It if often referred to as a superbug. MRSA infections cause more deaths in the United States every year than AIDS.
The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
There are 20 feet of blood vessels in each square inch of human skin.
![Much of the dark space between stars, as seen in the sky of the image above, is due to the human eye](https://biology-forums.com/gallery/47/medium_27605_22_04_12_6_16_47.jpeg)
![Stereo Image taken by NASA STEREO Probes launched in 2006; utilizing two Spacecrafts to image the Su](https://biology-forums.com/gallery/47/medium_12359_26_01_13_4_08_11.jpeg)
![The Hepatic Portal Blood Supply The liver receives water, minerals, and nutrients from the digestive](https://biology-forums.com/gallery/47/medium_32338_23_05_15_9_46_26_21855858.jpeg)