|
|
A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.
One way to reduce acid reflux is to lose two or three pounds. Most people lose weight in the belly area first when they increase exercise, meaning that heartburn can be reduced quickly by this method.
Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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.
![Physiological effects of the accumulation of lactose in the intestines of a lactose-intolerant indiv](https://biology-forums.com/gallery/47/medium_274247_21_01_15_7_40_16_20282429.jpeg)
![Joseph Moore and His Family (1839), by Erastus Salisbury Field, reflects the emerging middle-class f](https://biology-forums.com/gallery/47/medium_375348_18_08_15_9_36_28_22295845.jpeg)