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There are more nerve cells in one human brain than there are stars in the Milky Way.

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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

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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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Over time, chronic hepatitis B virus and hepatitis C virus infections can progress to advanced liver disease, liver failure, and hepatocellular carcinoma. Unlike other forms, more than 80% of hepatitis C infections become chronic and lead to liver disease. When combined with hepatitis B, hepatitis C now accounts for 75% percent of all cases of liver disease around the world. Liver failure caused by hepatitis C is now leading cause of liver transplants in the United States.

Mutations caused by air pollution. Mutations caused by air pollution.
Variegated leaves caused by a mutation in cpDNA Variegated leaves caused by a mutation in cpDNA
Diphtheria. The bacteria that cause this disease, called Corynebacterium diphtheriae, proliferate in Diphtheria. The bacteria that cause this disease, called Corynebacterium diphtheriae, proliferate in
Commonly Used Equivalents for the Apothecary and Metric Systems Commonly Used Equivalents for the Apothecary and Metric Systems
Drugs for the Treatment of Allergic Conjunctivitis Drugs for the Treatment of Allergic Conjunctivitis
The paired-image subtraction technique, which is commonly employed in cognitive neuroscience. Here ... The paired-image subtraction technique, which is commonly employed in cognitive neuroscience. Here ...
Video: Contraction and Relaxation Animation

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