[astrodust]

The great thing about Lua is the language itself is so small, and not just from an implementation perspective. The spec and documentation are also small because there's not much to learn.

You can explain it in an afternoon. Try that with C++ or JavaScript.

[jschwartzi]

It's also fast and it can be made to run in deterministic time. Plus the C API is something I can actually read and understand, which is true of none of the other scripting languages I've used(Python, Perl, et. al.).