And there are several open-source implementations of the Lisp programming language for the JVM out there, ready to be explored. So what makes Lisp worth looking at?

This hardware badge is a computer programmed with Lisp. You can write your own programs right on the badge using the built-in keyboard, as long as you know Lisp. If there’s one thing we reall… ...

I know it's a dialect of Lisp, and does things the functional way, but is it different enough from both Lisp (its parent) and ML (its colleague functional-programming-wise) to be useful to learn?