USB knee warmers--yes, that's right
We realize that hands aren't the only body parts that get chilled at the computer, but ... knees? It's one thing if you're arthritic, but otherwise--well, never mind.
If you really do suffer from unusually cold patellas, take heart: Vavolo has introduced the "Warmmi USB Heating Knee Pads" to save the day. At least it's not a Hello Kitty lap warmer.

