String Theory Explained
Enter the Multiverse
If you think of the most perplexing ideas in the world, for sure at one point, you will arrive before the string theory. Well, six additional dimensions, no particles, but strings, a multiverse. It will soon end up with a headache. But don't get desperate. Here you can enjoy one popular and yet quite an exhaustive introduction to the world of string theory. Take a look at the beautiful presentation of the Dutch theoretical physicist and string theorist - Robbert Dijkgraaf.