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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
People who have myopia, or nearsightedness, are not able to see objects at a distance but only up close. It occurs when the cornea is either curved too steeply, the eye is too long, or both. This condition is progressive and worsens with time. More than 100 million people in the United States are nearsighted, but only 20% of those are born with the condition. Diet, eye exercise, drug therapy, and corrective lenses can all help manage nearsightedness.
People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
There are approximately 3 million unintended pregnancies in the United States each year.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
![Image of pitcher plant mosquito Wyeomyia smithii, showing segmentation and partial anatomy of circul](https://biology-forums.com/gallery/47/medium_27759_23_04_12_7_45_01.jpeg)
![Hyperopia (farsightedness). In the uncorrected top figure, the image would come into focus behind th](https://biology-forums.com/gallery/47/medium_14755_27_08_12_12_24_59_82001466.jpeg)