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&nbsp;The Jordan Harbinger Show&nbsp;where&nbsp;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&nbsp;<a href="https://jessicawynn.substack.com/" rel="noopener noreferrer" target="_blank">Jessica Wynn</a>!Full show notes and resources can be found here: <a href="https://jordanharbinger.com/1272" rel="noopener noreferrer" target="_blank">jordanharbinger.com/1272</a>On This Week's Skeptical Sunday:<ul><li>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.</li><li>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 womb typically become left-handed. Your fetal position and which direction you turned your head may have sealed your southpaw fate.</li><li>Left-handers possess a larger corpus callosum — the neural bridge connecting both brain hemispheres — enabling faster communication between the two sides. This biological quirk gives lefties advantages in multitasking, creative problem-solving, and activities requiring rapid information processing like video game</li><li>Cultural conditioning has historically punished left-handedness, associating it with everything from uncleanliness to witchcraft. Schools once forced children to switch hands, and in some cultures today, using your left hand for eating remains taboo — a lingering echo of pre-toilet paper hygiene practices.</li><li>Celebrate your brain's beautiful asymmetry — whether you're a lefty or righty. Try using your non-dominant hand for everyday tasks on August 13th (International Left-Handers Day) to appreciate how deeply ingrained handedness really is. It's a humbling reminder of how wonderfully weird human development can be.</li><li>Connect with Jordan&nbsp;on <a href="https://twitter.com/JordanHarbinger" rel="noopener noreferrer" target="_blank">Twitter</a>, <a href="https://www.instagram.com/jordanharbinger" rel="noopener noreferrer" target="_blank">Instagram</a>, and <a href="https://www.youtube.com/c/THEJORDANHARBINGERSHOW" rel="noopener noreferrer" target="_blank">YouTube</a>. If you have something you'd like us to tackle here on Skeptical Sunday, drop Jordan a line at <a href="mailto:jordan@jordanharbinger.com" rel="noopener noreferrer" target="_blank">jordan@jordanharbinger.com</a> and let him know!</li><li>Connect with&nbsp;Jessica Wynn&nbsp;at&nbsp;<a href="https://www.instagram.com/iamjessicawynn/" rel="noopener noreferrer" target="_blank">Instagram</a>&nbsp;and&nbsp;<a href="https://www.threads.net/@iamjessicawynn" rel="noopener noreferrer" target="_blank">Threads</a>, and subscribe to her newsletters:&nbsp;<a href="https://jessicawynn.substack.com/" rel="noopener noreferrer" target="_blank">Between the Lines</a>&nbsp;and&nbsp;<a href="https://storiesbywynn.substack.com/" rel="noopener noreferrer" target="_blank">Where the Shadows Linger</a>!</li></ul><a href="https://itunes.apple.com/podcast/id1344999619?mt=2&ls=1" rel="noopener noreferrer" target="_blank">And if you're still game to support us, please leave a review here</a> — even one sentence helps! <ul><li>Sign up for <a href="https://jordanharbinger.com/course" rel="noopener noreferrer" target="_blank">Six-Minute Networking</a> — our free networking and relationship development mini course — at <a href="https://jordanharbinger.com/course" rel="noopener noreferrer" target="_blank">jordanharbinger.com/course</a>!</li><li>Subscribe to our once-a-week <a href="https://www.jordanharbinger.com/news/" rel="noopener noreferrer" target="_blank">Wee Bit Wiser</a> newsletter today and start filling your Wednesdays with wisdom!</li><li>Do you even Reddit, bro? <a href="https://www.reddit.com/r/JordanHarbinger/" rel="noopener noreferrer" target="_blank">Join us at r/JordanHarbinger</a>!</li></ul>This Episode Is Brought To You By <a href="https://www.jordanharbinger.com/deals/" rel="noopener noreferrer" target="_blank">Our Fine Sponsors</a>: <ul><li>Quiltmind: <a href="https://www.quiltmind.com/" rel="noopener noreferrer" target="_blank">Email jordanaudience@quiltmind.com to get started or visit quiltmind.com for more info</a></li><li>Momentous: <a href="https://www.livemomentous.com/" rel="noopener noreferrer" target="_blank">20% off first order: livemomentous.com, code JORDAN20</a></li><li>Homes.com: <a href="https://www.homes.com/" rel="noopener noreferrer" target="_blank">Find your home: homes.com</a></li><li>Progressive Insurance: <a href="https://www.progressive.com/" rel="noopener noreferrer" target="_blank">Free online quote: progressive.com</a></li></ul>See Privacy Policy at <a href="https://art19.com/privacy" rel="noopener noreferrer" target="_blank">https://art19.com/privacy</a> and California Privacy Notice at <a href="https://art19.com/privacy#do-not-sell-my-info" rel="noopener noreferrer" target="_blank">https://art19.com/privacy#do-not-sell-my-info</a>.

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