Uncertain

Buzz Aldrin, the second man to walk on the moon, talks about solar energy, buses between the planets, the Constellation program, his time on the moon and his new animated movie, Fly Me to the Moon. Plus, we'll test your knowledge of some recent science in the news. Web sites mentioned in this episode include www.snipurl.com/aldrin; www.sciamdigital.com; www.flymetothemoonthemovie.com

Courtney Humphries talks about her new book, Superdove: How the Pigeon Took Manhattan...And the World. Plus, we'll test your knowledge of some recent science in the news. Web sites mentioned in this episode include www.birds.cornell.edu/pigeonwatch; chumphries.org

In this special edition of Science Talk,Scientific American editor in chief, John Rennie, talks to Steve about the August issue of the magazine, which features articles on migraine, solar superstorms and self-cleaning materials

Former Washington Post Beijing bureau chief, Philip Pan, author of Out of Mao's Shadow: The Struggle for the Soul of a New China, discusses the science, technology, environment and culture of China with Scientific American's David Biello, who recently spent almost a month reporting from the country. Plus, we'll test your knowledge of some recent science in the news.

IEEE Spectrum editor in chief, Glenn Zorpette, talks about high-tech attempts to battle improvised explosive devices (IEDs) in Iraq as well as the state of reconstruction of Iraq's electricity grid. And journalist John Horgan talks about the possibility of eliminating war. Plus, we'll test your knowledge of some recent science in the news. Web sites related to this episode include: www.saferoadmaps.org, www.thomaslfriedman.com; www.spectrum.ieee.org

In this episode we feature five interviews conducted at the Digital Experience! computer and electronics expo that took place in New York City in June. Plus, we'll test your knowledge of some recent science in the news. Web sites related to this episode include: www.eye.fi; www.skype.net; www.synaptics.com; www.jakkspacific.com; www.m-audio.com

George Musser talks about his new book, The Complete Idiot's Guide to String Theory. Plus, we'll test your knowledge of some recent science in the news

Gary Stix discusses his July Scientific American cover article on DNA evidence for the history of human migration. And editor in chief, John Rennie, talks about the neuroscience of dance, the quantum cosmos and Rubik's Cubes. Plus, we'll test your knowledge of some recent science in the news. Web sites mentioned on this episode include www.sciam.com/sciammag

Princeton astrophysicist J. Richard Gott discusses some of the realities and speculations of time travel (one human holds the record for time travel--1/48 of a second) as well as how best to evaluate presidential election polling data. Plus, we'll test your knowledge of some recent science in the news. Web sites mentioned on this episode include www.colleyrankings.com, snipurl.com/2oorv

Glenn Zorpette, executive editor of IEEE Spectrum magazine, and journalist John Horgan discuss various ideas related to what some call "the coming singularity," a point where computers will allegedly attain consciousness and superintelligence. Or not. Plus, we'll test your knowledge of some recent science in the news. Web sites mentioned on this episode include www.spectrum.ieee.org/singularity

M. Night Shyamalan's new film, The Happening, involves an environmental backlash, the limits of reason and the beauty of math. SciAm editor George Musser discusses the film with the director. Plus, we'll test your knowledge of some recent science in the news. Web sites mentioned on this episode include www.sciam.com/daily

James Randi, famous debunker of frauds, talks about the "Amaz!ng Meeting" coming up in Las Vegas, and SciAm editor Mark Alpert discusses his new physics novel, Final Theory. Plus, we'll test your knowledge of some recent science in the news. Web sites mentioned on this episode include www.sciam.com/daily, www.badscience.net, www.randi.org, www.youtube.com/watch?v=m4vgsZmleoE