How many people are having sex at this instant? How many piano tuners are in the city of Chicago? How can we come up with reasonable estimates to questions like these? On this program, Dr. Aaron Santos discussed how to estimate anything.

The human skull has fascinated those interested in the inner workings of the human mind, even to the point of stealing skulls from the grave. On this program, Colin Dickey discussed the practice of Cranioklepty.

The vast number of stars in the night sky exhibit the full panoply of stellar life stages. On this program, Dr. Ken Croswell discussed the life of stars.

The rapid developments in science and technology are made easier to follow by excellent science writing. On this program, Jesse Cohen discussed the Best American Science Writing for 2009.

With the rapid advances in genetic technology, the history of the genetic revolution is often forgotten. On this program, James Schwartz discussed the history of the gene from Darwin to DNA.

Eating a sustainable diet involves moving closer to the source of the nutrients. But, is this possible in most of our diets? On this program, Terry Walters discussed establishing a clean food diet.

Uranium may be the most important element that shaped the history of the 20th century. On this program, Dr. Amir Aczel discussed Uranium Wars.

Energy produced using solar technology can be credited to the consumer under new net metering policies. On this program, Tom Djokovich discussed solar energy technology and net metering.

Technology drives much of the development of human society and economy. Yet, little attention is given to how technological innovations arise. On this program, Prof. W. Brian Arthur discussed the nature of technology.

Living with paralysis is a challenge for affected individuals. On this program, Joseph Canose discussed new research and support for paralysis.