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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.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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Essential fatty acids have been shown to be effective against ulcers, asthma, dental cavities, and skin disorders such as acne.
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The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.
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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
![A photograph of a woman with exophthalmos. This condition is associated with hypersecretion of the t](https://biology-forums.com/gallery/47/medium_14755_28_08_12_1_43_57_824167.jpeg)
![The Black Death spread over much of Europe in a three-year period in the middle of the fourteenth ce](https://biology-forums.com/gallery/47/medium_273688_23_02_15_7_45_11_208612424.jpeg)