Mmm. For me, Python. It helped me break through the biggest programming walls by gently introducing a ton of great concepts. There are practical applications I

Mmm. For me, Python. It helped me break through the biggest programming walls by gently introducing a ton of great concepts. There are practical applications I could point at, and I've moved on to shinier languages as well, but I think something so genuinely useful in educating me would have to go down as having the most cool factor of all.