Guinness Records have declared that Smokey the cat has the loudest purr of a domestic cat. Approaching the loudness of a lawn mower, the feline's constant purr has been measured at 67.7 decibels. More, including video, here.
In the first half of the show, Leonard Mlodinow, an author with a Ph.D. in theoretical physics, talked about the explosion of science in the last 50 years and how it's propelling us into a fascinating new future.
In the latter half, paranormal investigator, author, and publisher of Intrepid Magazine, Scott Roberts, talked about the veracity of biblical history and archaeology, and various metaphysical aspects.