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As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.

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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.

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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."

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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

Sequential decline of whale catches in the Antarctic shows the strong effect of human predators. Sequential decline of whale catches in the Antarctic shows the strong effect of human predators.
(A) Normal spongy bone. (B) Spongy bone with osteoporosis, which is characterized by a loss of bone (A) Normal spongy bone. (B) Spongy bone with osteoporosis, which is characterized by a loss of bone
Glioma. (a) Illustration of a large glioma (colored area) within the left cerebral hemisphere in a s Glioma. (a) Illustration of a large glioma (colored area) within the left cerebral hemisphere in a s
Effect of extracellular osmolarity on water movement across a plasma membrane Effect of extracellular osmolarity on water movement across a plasma membrane
Energy Transfer Processes: Free Convection Energy Transfer Processes: Free Convection
The demand for energy is met by burning coal and other fossil fuels The demand for energy is met by burning coal and other fossil fuels
Video: Optic Nerve and Optic Disk Animation (Part 2 of 2)

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