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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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The horizontal fraction bar was introduced by the Arabs.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.