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Did you know?
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
Did you know?
Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
Did you know?
HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
Did you know?
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.
Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
![Examples of four different types of cells from the body. Although each cell has a cell membrane, nuc](https://biology-forums.com/gallery/47/medium_14755_16_09_12_5_52_12_8537838.jpeg)
![The Canadian ballot is considerably simpler than the American ballot. Note there is nothing like a c](https://biology-forums.com/gallery/47/medium_262797_12_08_15_1_37_19_221871018.png)
![The American clipper ship, Red Jacket, off Cape Horn, sails from Australia to Liverpool, England, in](https://biology-forums.com/gallery/47/medium_375552_19_08_15_9_09_53_22328361.jpeg)