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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

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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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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

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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.

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Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.

Neurulation and the beginning of neural crest formation in vertebrates. Neurulation and the beginning of neural crest formation in vertebrates.
Model of a sequential study in which two cohorts were followed beginning at age 20. One cohort was f Model of a sequential study in which two cohorts were followed beginning at age 20. One cohort was f
Outcome of myocardial infarction. Forty percent of 1-week survivors have late complications ... Outcome of myocardial infarction. Forty percent of 1-week survivors have late complications ...
Humans have evolved, beginning in Africa Humans have evolved, beginning in Africa
Sabrina's Fabric Land bought $5,000 of equipment at the beginning of 2015. Amortization ... Sabrina's Fabric Land bought $5,000 of equipment at the beginning of 2015. Amortization ...
Barnacles extending feathery legs Barnacles extending feathery legs
Video: Hormones and the menstrual cycle Animation

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