An iPhone 4 Backing That Magically Changes Colors When You Touch It

Ordinary fingerprints on your iPhone 4? Passé. Fingerprints that can morph your iPhone 4 into a color changing chameleon!? Psychedelic. These heat sensitive backings, made by RF Laserworks, magically turn a variety of gnarly colors depending on the temperature (aka your finger). » 8/15/11 1:20pm 8/15/11 1:20pm

Too Hot or Too Cold? The Monkey's 'Fro Will Let You Know

This $3 monkey luffa has a head full of heat-senstive hair that changes from brown to yellow when it feels your bath is hot enough for you to jump in. [Product Page via Nerd Approved] » 4/06/09 10:40pm 4/06/09 10:40pm

Heat-Sensitive Knickers Don't Make Me Hot Today

Normally, I would get excited about these pants with a daisy that changes color when next to your hot hot skin. But it's Monday today, and Monday's the day I do the washing and the ironing. Tuesday is J.'s day for LEGO—he's currently attempting to do the Kama Sutra out of bricks, Wednesday we're watching all Flight of… » 5/12/08 6:50am 5/12/08 6:50am

Coffee Mug Knows When You're Going to Burn Yourself

Our father told us that the best way to test whether a steaming cup of anything was cool enough to drink was to just drink it. It wasn't until the fifth time we were in the hospital that we discovered that the man wasn't our father. If we had these heat-sensitive On/Off mugs, which change from the Off position when… » 11/30/07 2:45pm 11/30/07 2:45pm