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

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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

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Amphetamine poisoning can cause intravascular coagulation, circulatory collapse, rhabdomyolysis, ischemic colitis, acute psychosis, hyperthermia, respiratory distress syndrome, and pericarditis.

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The most dangerous mercury compound, dimethyl mercury, is so toxic that even a few microliters spilled on the skin can cause death. Mercury has been shown to accumulate in higher amounts in the following types of fish than other types: swordfish, shark, mackerel, tilefish, crab, and tuna.

Diagrams showing the multiple energy shells and orbitals of a nitrogen atom Diagrams showing the multiple energy shells and orbitals of a nitrogen atom
Sample Items from the Brief Multidimensional Measure of Religiousness/Spirituality (BMMRS) Sample Items from the Brief Multidimensional Measure of Religiousness/Spirituality (BMMRS)
Multiple sclerosis. Multiple sclerosis.
Multiple sclerosis is characterized by damage to the myelin sheath surrounding the axons of motor ... Multiple sclerosis is characterized by damage to the myelin sheath surrounding the axons of motor ...
After multiple injections of a local anesthetic, the patient developed herpetic lesions. After multiple injections of a local anesthetic, the patient developed herpetic lesions.
Multiple synapses on the body of a single neuron Multiple synapses on the body of a single neuron
Video: The 4 steps of translation Animation

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