Awesome tech you can't buy yet: Graffiti printing, smarter shades, a caffeine cuff

Check out our roundup of the coolest crowdfunding projects and product announcements that hit the Web this week. You can't buy this stuff yet, but it sure is fun to gawk! The post Awesome tech you can’t buy yet: Graffiti printing, smarter shades, a caffeine cuff appeared first on Digital Trends.