Parents’ Brains Sync When They’re Together, the Genius Math Behind Credit Card Numbers, and July’s Curiosity Challenge Trivia

Curiosity Weekly

Warner Bros. Discovery

Science

4.6 • 964 Ratings

🗓️ 7 August 2020

⏱️ 11 minutes

🔗️ Recording | iTunes | RSS

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Summary

Learn about the Luhn algorithm (the genius math behind credit card numbers) and how parents’ brains synchronize when they’re together. Then, play along at home and test your podcast knowledge with this month’s Curiosity Challenge trivia game.

The genius math behind credit card numbers by Cameron Duke

Berry, N. (2014, January 8). How Credit Card Numbers Work. Gizmodo; Gizmodo. https://gizmodo.com/how-credit-card-numbers-work-1493331190
Concerning Reality. (2018). The Secret Algorithm in Your Credit Card Number [YouTube Video]. In YouTube. https://www.youtube.com/watch?v=Yr9s5NjsVAo
Juber Moulvi Abdul. (2018, April 24). Mathematics behind Credit/Debit card numbering. Medium. https://medium.com/@ma.juber/mathematics-behind-credit-debit-card-numbering-340bf68d27d2

Parents' brains sync when they're together by Steffie Drucker

Presence of spouse alters how parents’ brains react to children stimuli, finds NTU Singapore study. (2020). EurekAlert! https://www.eurekalert.org/pub_releases/2020-05/ntu-pos051220.php
Azhari, A., Lim, M., Bizzego, A., Gabrieli, G., Bornstein, M. H., & Esposito, G. (2020). Physical presence of spouse enhances brain-to-brain synchrony in co-parenting couples. Scientific Reports, 10(1). https://doi.org/10.1038/s41598-020-63596-2
Vuchinich, S., Emery, R. E., & Cassidy, J. (1988). Family Members as Third Parties in Dyadic Family Conflict: Strategies, Alliances, and Outcomes. Child Development, 59(5), 1293–1302. JSTOR. https://doi.org/10.2307/1130492

Episodes referenced in Curiosity Challenge Trivia with Kyann

Saturated Fat Could Kill Your Focus, Animals Have Regional Accents, and Rings Around Mars https://curiositydaily.com/saturated-fat-could-kill-your-focus-animals-have-regional-accents-and-rings-around-mars/
The First Prescription Video Game, Solving the Mystery of Short-Term Memory, and Hummingbirds’ Extraordinary Vision https://curiositydaily.com/the-first-prescription-video-game-solving-the-mystery-of-short-term-memory-and-hummingbirds-extraordinary-vision/
You Navigate with Your Nose, Busting 5 Summer Myths, and Using Horseshoe Crabs’ Blue Blood to Develop New Medicine https://curiositydaily.com/you-navigate-with-your-nose-busting-5-summer-myths-and-using-horseshoe-crabs-blue-blood-to-develop-new-medicine/

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Find episode transcript here: https://curiosity-daily-4e53644e.simplecast.com/episodes/parents-brains-sync-when-theyre-together-the-genius-math-behind-credit-card-numbers-and-julys-curiosity-challenge-trivia

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Transcript

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0:00.0	Hi, you're about to get smarter in just a few minutes with Curiosity Daily from
0:04.8	Curiosity.com. I'm Cody Gough. And I'm Ashley Hamer. Today you learn about the
0:09.2	genius math behind credit card numbers and how parents brains synchronize when they're together.
0:14.8	Then play along at home and test your podcast knowledge with this month's Curiosity Challenge
0:19.3	trivia game.
0:20.3	Let's satisfy and challenge some curiosity.
0:24.0	When you shop online and enter your credit card number,
0:27.0	have you ever noticed that one wrong digit is enough for the card to be marked invalid?
0:32.0	Have you ever wondered why?
0:33.8	I mean, there are more than a billion credit cards in the world.
0:37.0	Why doesn't a mistake just charge someone else's card?
0:40.0	And like a credit card can be instantly rejected even if there's no internet connection, right?
0:44.5	Right! And it turns out that credit card numbers can do this all on their own, thanks to some really cool math.
0:51.6	It all comes down to the very last digit, called the check digit.
0:56.0	The check digit can tell you if a credit card number has been typed wrong or if it's even real.
1:01.0	It's determined by a math formula called the Loon algorithm, otherwise known as the
1:06.1	Modulo 10 algorithm. It works like this, and fair warning, this gets a little complicated.
1:12.2	So that final check digit is determined. Fair warning, this gets a little complicated.
1:13.2	So that final check digit is determined mathematically
1:16.2	by all the digits that come before it.
1:18.6	To calculate it, the first step
1:20.4	is to double every other digit,
	...

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