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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 modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
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You should not take more than 1,000 mg of vitamin E per day. Doses above this amount increase the risk of bleeding problems that can lead to a stroke.
![Positron emission tomography (PET) image showing the difference in the metabolic activity of the bra](https://biology-forums.com/gallery/47/medium_14755_27_08_12_12_14_19_81821620.jpeg)
![An example of color blindness test. A person with red-green color blindness would not be able to dis](https://biology-forums.com/gallery/47/medium_14755_27_08_12_12_28_10_82021889.jpeg)