為什麼有些人是左撇子？中英字幕演讲 |【TED演讲】 - Daniel M. Abrams

如果你認識年長的左撇子 很可能他們都曾被迫 要學著用右手寫字和吃飯 在世界各地 仍然普遍教小孩子要改用「正」手 甚至「右」這個字 也有「對」和「好」的意思 不只是英文 其他許多語言也如此 但是如果左撇子是錯的 那為什麼當初要有左撇子呢？

Today, about one-tenth of the world’s population are southpaws. Why are such a small proportion of people left-handed -- and why does the trait exist in the first place? Daniel M. Abrams investigates how the uneven ratio of lefties and righties gives insight into a balance between competitive and cooperative pressures on human evolution.

Lesson by Daniel M. Abrams, animation by TED-Ed.

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