iPhone Touch-Sensitive Screen
iPhones are designed to only recognize human touch on their touch-screens. That way, you don't accidentally call someone if your phone's in your pocket.
It's a nice feature, but was tricky this winter, because I had to remove my gloves to operate the phone. I don't understand the technology, but for some reason it has to be flesh touching the screen. My nose works. My elbow works. Just no fabric.
Then today, for the final test, I borrowed my deeply-napping Pug's paw.
Animal testing? Cruel? Not here, this was awesome.