He explains the problems of translating language, computer science, and artificial intelligence.

The best class I took in college was on the philosopher Ludwig Wittgenstein. Until that point, I had avoided philosophy of language as simply being too esoteric and hermetic to be of use. David Pears, a prodigious yet modest and approachable figure visiting from Oxford, changed my mind.

Source: http://www.slate.com/articles/life/classes/2015/09/take_a_wittgenstein_class_he_explains_the_problems_of_translating_language.single.html