Amazon has installed digital palm readers at Whole Foods. The reader scans your palm, collecting biometric data, and links it to your credit card to pay for your groceries. What does exchanging vein mapping for eggs and butter mean for the future of data security and in-person shopping.  Guest: Emily Moore, freelance tech and food journalist Want more What Next TBD? Subscribe to Slate Plus to access ad-free listening to the whole What Next family and all your favorite Slate podcasts. Subscribe today on Apple Podcasts by clicking “Try Free” at the top of our show page. Sign up now at slate.com/whatnextplus to get access wherever you listen. Podcast production by Evan Campbell, Patrick Fort, and Cheyna Roth. Learn more about your ad choices. Visit megaphone.fm/adchoices