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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
Most strokes are caused when blood clots move to a blood vessel in the brain and block blood flow to that area. Thrombolytic therapy can be used to dissolve the clot quickly. If given within 3 hours of the first stroke symptoms, this therapy can help limit stroke damage and disability.
There are approximately 3 million unintended pregnancies in the United States each year.
In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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.