This holiday season, Bill Gates wants stuff that doesn’t exist. Not for himself, mind you, but for the developing world. Gates has tons of ideas for products that would improve lives there, if only someone would build them. So WIRED decided to bring his wish list to life: We asked four premier product design firms to turn some of his notions into full-blown prototypes. The results are a bit fanciful—but every lifesaving innovation starts with a great idea.
Tricorder for Farmers