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There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.
Street names for barbiturates include reds, red devils, yellow jackets, blue heavens, Christmas trees, and rainbows. They are commonly referred to as downers.
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.
Approximately 25% of all reported medication errors result from some kind of name confusion.
To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.
![The stages of labor and delivery. (A) During the dilation stage the cervix thins and dilates to 10 c](https://biology-forums.com/gallery/47/medium_14755_28_08_12_1_52_24_82561428.jpeg)
![Timing of teratogens. Vulnerability to teratogens is greatest in the embryonic period. Source: Moore](https://biology-forums.com/gallery/47/medium_351728_31_05_15_9_12_12_219982425.jpeg)