My first "pocket calculator" was an HP-45. I still have one on my desk, although I rarely use it because I don't want to burn out the LEDs, which do not age w

My first "pocket calculator" was an HP-45. I still have one on my desk, although I rarely use it because I don't want to burn out the LEDs, which do not age well into their 4th and 5th decades. Instead I use an HP-45 simulator on my phone. Somehow it just feels right.