![Leonard Susskind quotes: [Richard Feynman] truly believed that if you couldn't explain something simply, you didn't understand it.](http://www.wisefamousquotes.com/images/leonard-susskind-quotes-1079455.jpg "Leonard Susskind quotes: [Richard Feynman] truly believed that if you couldn't explain something simply, you didn't understand it.")
The success of ordinary cosmology speaks against the idea that the universe was created in a random fluctuation. 
I have always enjoyed explaining physics. In fact it's more than just enjoyment: I need to explain physics.
Einstein, in the special theory of relativity, proved that different observers, in different states of motion, see different realities.
At some point we have to give up and say that's just the way it is. Or, not give up and push on.
Eventually, when the universe expands enough, all that will be left is the dark energy. 
You have to say now that space is something. Space can vibrate, space can fluctuate, space can be quantum mechanical, but what the devil is it? 
A lot of my research time is spent daydreaming - telling an imaginary admiring audience of laymen how to understand some difficult scientific idea. 
I'm a great believer that scientists should spend as much time as possible explaining, and you do explain in the process of teaching. 
I was going to engineering school but fell in love with physics. 