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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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The horizontal fraction bar was introduced by the Arabs.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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Cyanide works by making the human body unable to use oxygen.
![Midway Island, an inhospitable atoll acquired in 1867, was valuable as a military base located midwa](https://biology-forums.com/gallery/47/medium_6_02_03_16_7_45_21_234011450.jpeg)
![This military command post is in South Korea, with both U.S. and South Korean personnel. South Korea ...](https://biology-forums.com/gallery/28/medium_482573_20_04_17_2_29_14_280501980.png)