Disclaimer: In the future, you will not have to worry about spills like this one, what with the superhydrophobic fabrics and all. But that technology is not widely available quite yet, so the t-shirt you could win simply by retweeting us on Twitter is susceptible to saturation by liquids of all sorts. This is regrettable, but we felt we should level with you. It's still a pretty sweet shirt, though.
The rules: Follow us on Twitter (we're @PopSci) and retweet our This Week in the Future tweet. One of those lucky retweeters will be chosen to receive a custom t-shirt with this week's Baarbarian illustration on it, thus making the winner entirely too cool for their school, or place of business, or couch. (Those who would rather just buy the t-shirt can do that here.) The stories pictured therein:
And don't forget to check out our other favorite stories of the week:
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.