5-Minute Projects

Editor Jake Ward demonstrates how to use an old plastic container and a can of air to take a beer from lukewarm to mountain-stream cold in just a few seconds. (For another video of this project, visit sonicIntoX’s channel at Metacafe.)

Downsize your pocket cargo with a custom-fit keychain. Editor Sean Captain ditches the ring and uses more tool than necessary to trim a small bolt to just the right size for his set of keys. (For a slightly different take on the project, see the site that inspired us: carlitoscontraptions.blogspot.com).

Editor Doug Cantor demonstrates how a drill and a few zip ties can transform a stack of old floppies into a handy box for holding those even older data-recording devices: your pens. For more detailed instructions, head to the original Instructable for this project, courtesy of completegeek.

Satisfy your scientific curiosity and your craving for some Frosted Flakes. Editor Mike Haney shows you how to use an old cereal box and a CD to build a device that reveals the hidden rainbow inside any light source. Find more examples of DIY spectrometers over at Wikipedia.

In the age of mp3s, most people have a lot of old CDs lying around. Instead of throwing them in the trash, though, you can put them to use in a way that's both eco-friendly and healthy. Thread the discs onto the ends of a thin metal rod and secure them in place with bolts to make a usable (and cool-looking) dumbbell. Tape up the middle of the rod to provide a comfortable grip, and you'll be all set for a workout.

Submit a 5 Minute Project for Popular Science! Each month we feature a cool and handy new project, and we're excited to showcase some ideas from the inventive Instructables.com community, and our own.

World of wires got you down? Clear the clutter with your very own fire-proof gadget charging station. Editor Mike Haney shows how a power drill and some tape can transform a bread box into a pint-size panic room just for chargers.

About to chuck that busted CD? Not so fast, young grasshopper. Web editor Megan Miller demonstrates three ways to resurrect those scratched discs using stuff you probably already have sitting on your shelf.

When you're vacationing on a beach, nothing beats an underwater camera; but watertight cases are pricey and disposables have lousy quality. Lucky for you, the editors of PopSci have come up with an easy workaround using something there's probably already plenty of in your suitcase (hint: not socks). That's right, thanks to the magic of unlubricated condoms, you too can transform your point-and-shoot into an waterproof wonder. The set-up is easy enough, but as John and Doug demonstrate, it really does help to have a partner lend a hand.