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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).
As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.