I'm so much an RPN geek that I have an HP 41CX emulator for my phone, because my physical calculator isn't everywhere. (It's actually an excellent emulator, bu

I'm so much an RPN geek that I have an HP 41CX emulator for my phone, because my physical calculator isn't everywhere. (It's actually an excellent emulator, but of course there's no tactile feel to be had from the keys, which I miss a lot)