http://ed.ted.com/lessons/why-are-some-people-left-handed-daniel-m-abrams#watch
https://quizlet.com/144892202/ted-ed-video-clip-why-are-some-people-left-handed-by-daniel-m-abrams-flash-cards/
http://ed.ted.com/lessons/why-are-some-people-left-handed-daniel-m-abrams
