Once upon a time, when banks observed the gold standard, every dollar was backed by an equal amount of metal. Put simply, your money was in the vault. But now cash is all most people ever get to hold, and as the dollar goes digital, the only tangible vestige of your wealth will soon be the computer that keeps track of it. So where is your money today?
Stay up to date on the latest news of the future of science and technology from your iPhone with full articles, images and offline viewing
Featuring every article from the magazine and website, plus links from around the Web. Also see our PopSci DIY feed
Share links with friends, comment on stories and more
In our December issue, Popular Science names the 100 best innovations of the year: bombproof wallpaper, self-parking cars, the fastest helicopter, and 97 more. Plus inventor profiles and videos.
Check out the best of what's new here.