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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

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In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.

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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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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 liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.

Three different ginkgo formulations: tablets, tea bags, and liquid extract Three different ginkgo formulations: tablets, tea bags, and liquid extract
The arrangement of water molecules in (a) solid ice, and (b) liquid water. The arrangement of water molecules in (a) solid ice, and (b) liquid water.
Ice, liquid water, and water vapor Ice, liquid water, and water vapor
Tumor marker analysis of a patient undergoing therapy, who (1) after surgery had residual disease ... Tumor marker analysis of a patient undergoing therapy, who (1) after surgery had residual disease ...
The structure of liquid water The structure of liquid water
Net cooling of the poles and warming at the equator Net cooling of the poles and warming at the equator
Video: Cerebral Cortex Animation

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