Lawrence Krauss, author of A Universe From Nothing, explains what nothing is.

What Is Nothing? A Physicist Explains

Conversations With Fascinating People.
Jan. 17 2012 3:55 PM

What Is Nothing? A Physicist Explains

Physicist Lawrence Krauss’ new book, A Universe From Nothing, raises a question: What do we mean by nothing? Certainly you’d have to get clear on that before moving on to the book’s subtitle: Why There Is Something Rather than Nothing. So Krauss and I did our best to get to the bottom of nothing, notwithstanding our disagreement about where that is:  

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