When did we first start sending holiday cards and will the tradition ever end? Plus, the health risks for humans in space and a high-tech sleeping bag that could prevent astronauts’ vision from deteriorating. And, Keanu Reeves explains what was going on in the infamous Sad Keanu photo.Sponsors:Tentree, Use code KOTTKE to get 15% off at tentree.comGiveWell, Have your donation matched up to $250 by entering Kottke Ride Home at check out at GiveWell.orgLinks:A Brief History of the Holiday Card (JSTOR Daily)Millennials are embracing the tradition of holiday cards (Washington Post)Christmas: A Candid History by Bruce David ForbesHalloween: The History of America's Darkest Holiday by David J. SkalNASA scientists consider the health risks of space travel (Space.com)NASA's new sleeping bags could prevent eyeball 'squashing' on the ISS (Engadget)Space sleeping bag to solve astronauts' squashed eyeball disorder (BBC)Study Investigates How Men and Women Adapt Differently to Spaceflight (NASA, 2011)Keanu Reeves finally explains "Sad Keanu" to Stephen Colbert (A/V Club)Keanu Reeves, Matt Kindt, and Ron Garney talk about 'BRZRKR', the top selling debut comic in 30 years (Mashable)Kottke.OrgJackson Bird on TwitterSee Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.