This summer I finally managed to saw the movie “The Unbelievers”, a movie that I highly recommend (whatever your beliefs might be). After I watch it I made some research about Lawrence Krauss because I had never heard his name. I found a lecture he gave about the Universe and the current theories about it.
Krauss is Foundation Professor of the School of Earth and Space Exploration at Arizona State University and director of its Origins Project.  He is a theoretical physicist who beseech explanations for cosmology. Particularly devoted to the themes of the begin of the Universe and it’s ending.
I’m fascinated about astrophysics and I have studied a bit of it (through minutephysichs, ed.ted and wikipedia) so for me it was an awesome way of giggling and have a good time learning more and remember about dark energy, dark matter, cosmic microwave background, etc… 
All this for saying that you might want to study a little (e.g. wikipedia), in order to fully understand the talk.
Hope you enjoy it and learn something!
References and further reading.
 – WMAP – Nasa