Talk given at the SSSW 2013 Semantic Web Summerschool.
Part 1: What is "Semantic Web" (in 4 principles and 1 movie)
Part 2: What question can we ask now that we couldn't ask 10 years ago
Part 3: Treat Computer Science as a *science*, not just as engineering!
(this part a short version of http://slidesha.re/SaUhS4 )