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An important invention was made in 1903 by the Austrian Carl Auer von Welsbach who patented what is today known as a "flint", consisting of pyrophoric alloys, 70% cerium and 30% iron, which when scratched or struck would give off sparks sufficient to light the fuel
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Oral cancer develops because the cells in the mouth develop mutations in the DNA
In fact, heritability estimates for smoking initiation range between 0.32 and 0.78, meaning that genetic factors have a moderate effect on the behavior (Do: 2016)
However, because the inverse-variance weighted method is sensitive to invalid instrumental variables and pleiotropy 25 , several sensitivity analyses were additionally performed, including weighted median, MR Egger, MR-Egger-SIMEX and MR-PRESSO
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