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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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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

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In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.

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ACTH levels are normally highest in the early morning (between 6 and 8 A.M.) and lowest in the evening (between 6 and 11 P.M.). Therefore, a doctor who suspects abnormal levels looks for low ACTH in the morning and high ACTH in the evening.

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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

An analogy for how cardiac output, resistance, and blood pressure are related. An analogy for how cardiac output, resistance, and blood pressure are related.
The path of blood flow through the chambers of the left and right side of the heart, including the v The path of blood flow through the chambers of the left and right side of the heart, including the v
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
Hydronephrosis. Normal kidney (left) and kidney with hydronephrosis (right) are compared. Note the d Hydronephrosis. Normal kidney (left) and kidney with hydronephrosis (right) are compared. Note the d
Hematopoiesis: Blood cells are formed from stem cells under the influence of hormones such as ... Hematopoiesis: Blood cells are formed from stem cells under the influence of hormones such as ...
Functions and Properties of Blood Functions and Properties of Blood
Video: Osmosis - Isotonic, Hypotonic, and Hypertonic​ Solutions

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