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Reusable handwarmers that get hot by freezing

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Channel: Technology Connections
Categories: Chemistry   |   Science   |   Technology  
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These things are so cool they're hot.

Here's some links.
Technology Connextras (the second channel that stuff goes on sometimes):
https://www.youtube.com/channel/UClRwC5Vc8HrB6vGx6Ti-lhA
Technology Connections on Twitter:
https://twitter.com/TechConnectify
The TC Subreddit
https://www.reddit.com/r/technologyconnections

This channel is supported through viewer contribution on Patreon. Thanks to the generous support of people like you, Technology Connections has remained independent and possible. It's how I can tell you these hand warmers don't really work! If you'd like to join the amazing people who've pledged their support, check out the link below. Thank you for your consideration!
https://www.patreon.com/technologyconnections

And thanks to the following patrons!
Andrew Haber, Joseph Prest, Scott Waldron, Cesar De Souza, Lars Naurath, Mike SoRelle, Taylor Vaughn, BabyET, Nicholas Blair, Richard Stephens, Ken Kasal, William McDermet, Brian Recchia, Philip Buonadonna, Justin Smith, BoneDepot, Barbara Ganschow, Amanda , Tino, James RC car, Colin Brady, Andy , Colin Mutter, Ray Everett, Simon Priisholm, Westley Bisson, Connor Taffe, Giannnnnnn, Todd Hawk, Rich Delgado, Romain Dutot, Brian Hamilton, George , Caius Worthen, Justin Byers, Falldog , Funnyjk, David Guerrero, John Feldman, Joshua Laughlin, Ted Ledbetter, Harrison Densmore, Derek Rose, Tobias Putz, Caytlin Vilbrandt, Alex Rich, Geo (Overand), Nikhill Rao, Robert Fletcher, William PS, Douglas Geusz, Andrew Sorensen, Alexane Desbiens, Bob Frankston, StukaPizza, Nick Kourpias, Stateless, Benhart, Sao, James Mereness, SeaburyNorton , Zach Berger, Lew Zealand, Shaitageth, Saghetti, DegaLaman, Daniel Castonguay, FirenzeFire , Mason DeBord, Jarocks, Frank Tobias, Nathaniel Robichaud, Andrew White, YanestraAgain, Benjamin Richards, Chris Brosz, Stewart , Kyle Burton, Jonas Lhrig, Joseph Crain, Steve Plegge, Russell Grant, Josh Stern, Dan Simon, cparks1000000 , Tiago Paes, Lee , Kyle , Brendan Siwik, Puffin, PullingMySupportBut1stSuggestNewCrunchwrapsTheSupremeIs2Leftest, Ellis , David Glover-Aoki, iPaq , RandomAdam , Peter Murray, Patrik Elgstrand, probnot, Tony The Bologna, Mike West, Kenneth Perronne, The Great Geno, mini mac, Kara Durocher, Neil Brimelow, Andrea Seward, Mark Lewin, Fumoffu Cerberus, William Preston, Victor , Nextstepheli .Nextstepheli, Jared Fry, Nathan Bergey, Steve Davis, Kevin Ware, Keiran Hillcoat, Cliff K, David Lefton, Chris O'Dea, Tyler, Jason and Katie Corradino, Eric Lemar, kyhm , Matthew J, Alex Gartrell, Spencer R, William O'Driscoll, Daniel Osborne, Sam Ellis, Christian Bikle, Christian Czekay, Nick , Andrew Backer, Stephen Lear, Jonathan Tunnell, Gary Ziroli, MiNX6, Forrest P, FrenchSword , Michael K Fink, Marie and Peter, Trevor Rudolph, Kevin Rogers, Ian Greig, Jaye Martindell, Adam Marshall, Chris Weinkauf, Luke Hogan, Brian Alvarez, Alex Berliner, Kevin Marty, Chris Decker, Beauwight , Tamas Bajcsi, Brandon C., Bram , Paul Adamski, David Joubert, Josh McMillan, Kyle Ward, Anders Madsen, Oliver Cross, Blaze Marshall, Nicholas Fazio, Josh Jones, Chrono , Pietro Gagliardi, Tom Oliver, Kornel , Becca Roughton, Romans Bajevs, Fernando Martinez, David Carpenter, Steve Martin De Souza, DensityJR, Joseph Shivak, Y , Ben Douglass, Brentton Paulus, Nicholas Bellamy, Al Davis, Noah Kantrowitz, Aleksander , Thelogaan, Lauren Nodonly, Jeremy , Paul Schermerhorn, Tiffany Su, Colleen Dunseath, Tashlin Familiy, James Pain, Lellius Rose, andritolion, Jack Conner, Adi , Christopher Berger, Nathaniel Kren, Simon J, Vamsikrishna Gopikrishna, Chris Dion, RICHARD CROWLEY, EmpiricalFox, Merijn Schalks, Alexander Curtiss, Thomas Schenck, Charles Czysz, Windows98 , Clark Marx, Sierrajulietalpha, Rambling Nerd, James Cooper, Erik Hasse, Lulidine, Travis Whatley, RangerMankin, GigaDan , Marc Chametzky

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