Why so much BASIC language?
The biggest program I've ever written was actually in PROLOG but I HAVE written a lot of BASIC language code.
BASIC is one of the most popular languages for RAD (rapid application development)/ rapid (software) prototyping. Artificial intelligence research involves lots of exploratory programming. Experimental programming is an ideal place to make use of RAD.
BASIC, being simple, is also good for students (see my Jan. 1, 2012 post on physics without calculus for example).