For at least the last 200,000 years, between 10-15% of the human population are left-handed and this fact has utterly left science baffled. In searching to explain handedness, all sorts of contradictory evidence has emerged, creating a fascinating mystery. Learn all about it in this classic episode.
Oct 2025
Lefties, righties and mixed-handers: The psychology of brain asymmetry, with Sebastian Ocklenburg, PhD
Left-handers make up about 10.6 percent of the world’s population. Sebastian Ocklenburg, PhD, talks about why handedness and other brain asymmetries exist; the genetic and environmental factors that influence handedness; whether there’s any truth to the stereotype that lefties ar ... Show More
36m 46s
Feb 2018
Howard I. Kushner, “On the Other Hand: Left Hand, Right Brain, Mental Disorder, and History” (Johns Hopkins UP, 2017)
In the early twentieth century, Robert Hertz, a French anthropologist, and Cesare Lombroso, the Italian criminologist, debated the causes and consequences of left-handedness. According to Lombroso, left-handed individuals were more likely to be criminals. Hertz disagreed. For him ... Show More
49m 16s
Nov 2024
Why are there lefties and righties?
This week on Unexplainable or Not, we’ve got three scientific mysteries all about left and right. Jonquilyn Hill, host of Vox’s new podcast Explain It to Me, is going to guess which of them has been solved and which ones are still unexplainable.
Guest: S. Furkan Ozturk, researche ... Show More
27m 50s