Why are some people left-handed?

Lessons Worth Sharing TED-Ed Original Lessons Why are some people left-handed? - Daniel M. Abrams Animation by TED-Ed 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. View full lesson » How do dogs "see" with their noses? - Alexandra Horowitz Animation by Provincia Studio You may have heard the expression that dogs ‘see with their noses.’ But these creature’s amazing nasal architecture actually reveals a whole world beyond what we can see. Alexandra Horowitz illustrates how the dog’s nose can smell the past, the future and even things that can’t be seen at all. View full lesson » Why do we have museums? - J. V. Maranto Animation by Zedem Media Museums have been a part of human history for over 2,000 years -- but they weren't always like the ones we visit today. J.V. Maranto uncovers the evolution of museums, from the first museum in 530 BC (curated by a princess) to PT Barnum’s freak shows and beyond. View full lesson » TED-Ed Selects I forgot my phone View full lesson Featured Blog Post What I learned from watching every TED-Ed Lesson TED-Ed Community The importance of slowing down TED Talk Lesson Don't misrepresent Africa - Leslie Dodson View full lesson TED-Ed Tumblr What is Zeno’s Dichotomy Paradox? - Colm Kelleher Copyright © 2015 TED-Ed, All rights reserved.   TED-Ed 250 Hudson St Suite 1002 New York, NY 10013