Now you jogged my memory... https://www.wired.com/2009/11/18-button-open-office-mouse-makes-a-keyboard-look-minimal/ https://www.wired.com/2009/11/18-button-op

Now you jogged my memory... https://www.wired.com/2009/11/18-button-open-office-mouse-makes-a-keyboard-look-minimal/ https://www.wired.com/2009/11/18-button-open-office-mouse-ma... Also, didn't early mouse experiments involve rodents with many more buttons than the 2-3 that's common today?