If You're Left-Handed — DNA Finally Revealed Why Only 10% of Humans Are

For thousands of years, left-handed children were forced, shamed, and physically restrained into using their right hand — including a young Prince Albert, the future King George VI, whose famous stammer emerged in the exact years his left hand was tied down. But no matter how hard cultures tried to stamp it out, roughly 1 in 10 humans has remained left-handed in every society ever studied. In this video, we dive into: ✅ Why "sinister" comes from the Latin word for left — and how nearly every religion built morality around the right hand ✅ The decades-long scientific stalemate: is handedness genetic or environmental? ✅ The landmark 2019 Oxford study of 400,000 brains that changed everything ✅ Why handedness is only 25% heritable — and what fills in the rest ✅ The "fighting hypothesis": why left-handers are overrepresented in boxing, fencing, and violent societies ✅ How gene expression differences appear in the spinal cord by week 8 of pregnancy — before the brain even forms ✅ Why identical twins can have different dominant hands ✅ What this means for how we understand traits we think define us This isn't just a story about which hand you write with. It's a story about how genetics really works — probabilities, not blueprints. 🔔 Subscribe for more deep dives into genetics, human biology, and the science behind traits we take for granted. 👍 Like this video if it changed how you think about left-handedness. 💬 Comment below: Are you left-handed, or does it run in your family? #Lefthanded #Genetics #Neuroscience #HumanBiology #PopulationGenetics #BrainScience #ScienceExplained #Handedness #Epigenetics #kinggeorgevi