Scientists have long-posited that one single gene may determine whether a person is left- or right-handed (the latter, of course, being dominant, with 90% of people favoring their right). This theory does take into account the fact that environment factors (including geography and culture) likely play a critical role, too. Now, however, several studies involving millions of participants reveal that dozens of genetic variations may shape our preference “in small, unexpected ways,” reports the Wall Street Journal. This goes further than which hand reaches for the morning coffee, and takes into account neural signal processing and “the way we talk about morality, creativity and politics.” Read more about fascinating genetics discoveries behind it all at the WSJ.
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