MIT OpenCourseWare has some dope online materials to learn some of the most interesting things in the known universe. Here are some recommendations; tried and tested for total coolness..
The Early Universe, Professor Alan Guth (first lecture asks: Is Our Universe Part of a Multiverse?)
Physical Chemistry, Professor Robert Guy Griffin, Professor Troy van Voorhis (first lecture: Where does quantum physics fit into chemistry?)
Bio-Inspired Structures, Professor Leo Daniel (first lecture: observing birds leading to human flight, quite natural given Professor Daniel specialises in aeronautics).