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Around 10% humans & most of the kangaroos show this attribute.
In humans, it is thought to give advantage in certain fields such as music, sports, etc. Some famous personalities known to have this attribute are Oprah, Sir Paul McCartney, Lady Gaga & Bart Simpson.
13th August is celebrated for this. What am I talking about?

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Left Handedness
In humans, handedness is thought to be related to genetics, hormones or our language development.
People have also studied its correlation to multiple factors. Read More.