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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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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.

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Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.

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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

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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.

Snow crystal Snow crystal
Steps in determining the structure of sperm whale myoglobin by x-ray crystallography Steps in determining the structure of sperm whale myoglobin by x-ray crystallography
Comparison of Steps of the Nursing Process with the Research Process Comparison of Steps of the Nursing Process with the Research Process
Steps of the Scientific Method Steps of the Scientific Method
Wearing a pedometer, like the one shown here, can help you track your steps Wearing a pedometer, like the one shown here, can help you track your steps
Steps in the processing and splicing of mRNA Steps in the processing and splicing of mRNA
Video: The 4 steps of translation Animation

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