The Jordan Harbinger Show

Scissors, spiral notebooks, cultural taboos — lefties have it rough. Jessica Wynn explores why 10% of us are southpaws here on Skeptical Sunday.Welcome to Skeptical Sunday, a special edition of The Jordan Harbinger Show where Jordan and a guest break down a topic that you may have never thought about, open things up, and debunk common misconceptions. This time around, we’re joined by writer and researcher Jessica Wynn!Full show notes and resources can be found here: jordanharbinger.com/1272On This Week's Skeptical Sunday:Left-handedness isn't controlled by a single gene — it's a cocktail of genetics, prenatal environment, and random brain development. The rare gene variant TUBB4B shows up three times more often in lefties, but even identical twins sharing 100% of their DNA can have different dominant hands.Your handedness was essentially decided before you were born. Ultrasound studies reveal fetuses showing consistent hand preferences by 18 weeks — those who suck their left thumb in the w