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Looking at the sun may not only cause headache and distort your vision temporarily, but it can also cause permanent eye damage. Any exposure to sunlight adds to the cumulative effects of ultraviolet (UV) radiation on your eyes. UV exposure has been linked to eye disorders such as macular degeneration, solar retinitis, and corneal dystrophies.

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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.

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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.

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Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).

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The use of salicylates dates back 2,500 years to Hippocrates's recommendation of willow bark (from which a salicylate is derived) as an aid to the pains of childbirth. However, overdosage of salicylates can harm body fluids, electrolytes, the CNS, the GI tract, the ears, the lungs, the blood, the liver, and the kidneys and cause coma or death.

An example of a two-component regulatory system in bacteria An example of a two-component regulatory system in bacteria
Sequential decline of whale catches in the Antarctic shows the strong effect of human predators. Sequential decline of whale catches in the Antarctic shows the strong effect of human predators.
Sensory Pathways of the CNS Sensory Pathways of the CNS
Changes in the bronchioles during an asthma attack: (a) Normal bronchiole; (b) the inflammatory comp Changes in the bronchioles during an asthma attack: (a) Normal bronchiole; (b) the inflammatory comp
The birth weight of human infants is tightly constrained by natural selection. The birth weight of human infants is tightly constrained by natural selection.
Sensory and Motor Tracts Sensory and Motor Tracts
Video: Male Reproductive System - Testosterone

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