In general, about one-tenth of the world’s population are southpaws.
Have you ever wondered what is means to be left-handed and why this trait happens at all? 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.
“Archaeological evidence shows that it’s been that way for as long as 500,000 years with about 10% of human remains showing the associated differences in arm length and bone density, and some ancient tools and artifacts showing evidence of left-hand use.”
Lesson by Daniel M. Abrams, animation by TED-Ed.