Guests: Joel R. Primack and Nancy Ellen Abrams.

Today on Focus, cosmologist Joel R. Primack and his wife, author Nancy Ellen Abrams, join the show to discuss their new book, The View from the Center of the Universe: Discovering our Extraordinary Place in the Cosmos. The book claims to reveal an astonishing truth: humans really are central to the universe. 

Guest: Simon Singh.

The Big Bang model of the universe offers an elegant explanation of everything we see in the night sky, making it one of the greatest achievements of the human intellect and spirit. Even more wonderful, says science writer Simon Singh, it can be understood by everyone. Join us today on Focus as we talk with Singh about how scientist arrived at this remarkable theory.

Guest: Neil deGrasse Tyson.

How did the universe begin? It's a question that plagued scientists for centuries, and one that astrophysicist Neil deGrasse Tyson explores in his recent book Origins: Fourteen Billion Years of Cosmic Evolution. He joins us on Focus today to discuss the formation of the universe, as well as its galaxies, planets... and inhabitants.