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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

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Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.

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In 1864, the first barbiturate (barbituric acid) was synthesized.

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A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

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Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.

The Amazon River Watershed The Amazon River Watershed
In addition to common schools, thousands of female seminaries were built between 1820 and 1850, many In addition to common schools, thousands of female seminaries were built between 1820 and 1850, many
V-shaped Valley of the Yellowstone River V-shaped Valley of the Yellowstone River
Meander Loop on the Colorado River Meander Loop on the Colorado River
Nile Crocodile. Nile Crocodile.
A Platypus swimming in Broken River, Eungella National Park, Queensland, Australia. A Platypus swimming in Broken River, Eungella National Park, Queensland, Australia.
Video: Cytotoxic T cell receptors, activation, proliferation, differentiation & action

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