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Author Question: The Earth is one of ________ planets in the solar system. A) four B) eight C) twenty D) thirty ... (Read 37 times) |
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.
Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
There are 60,000 miles of blood vessels in every adult human.
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.