New tools for parents! Continuous monitoring fever stickers? YES!

Alright, who invented these and didn't tell me? I mean really, a cute sticker I can leave on to monitor my wriggly baby's fever? Genius. I just wandered across it like that but it makes me wonder "what else am I missing?"
Physio Logic Fever-Bugz Stick-On Fever Indicators - I don't want my son to get sick but I do want to try these so.... ;-)