Today I Found Out
Why Some People are Right Handed And Some Left Handed (2015x183)
Air date: Dec 01, 2015
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In this video:
There is no single mechanism that will definitively determine which hand you will prefer. Technology and further studies will continue to help shed light on the subject. What is known is that it essentially comes down to genes and biological asymmetry in the human brain. What tends to be true in so many other aspects of human preference, handedness also seems to be more of a spectrum. You have some people who strongly prefer right or left handedness, and some that can use both with the same level of comfort. Then there are countless people who have different degrees of ability using their non-dominant hand.
Want the text version?: http://www.todayifoundout.com/index.php/2012/12/why-some-people-are-right-handed-and-some-left-handed/
Sources:
http://www.scientificamerican.com/article.cfm?id=what-causes-some-people-t
http://www.nytimes.com/2011/03/08/health/views/08klass.html?_r=0
http://www.sciencedaily.com/releases/2007/08/070805141533.htm
http://www.sciencedaily.com/releases/2011/12/111227092931.htm
http://facts.randomhistory.com/facts-about-left-handedness.html
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