Uncertain

Scientific American magazine Editor in Chief Mariette DiChristina talks about the January issue, including articles on the chances of conditions conducive to life elsewhere in the multiverse and the growing practice of virtual gold farming, in which legions of online game players in developing countries acquire currency in the game that they sell to other players for real money. Web sites related to this episode include www.snipurl.com/nobelfrank; www.redcross.org; www.pih.org

Alan Alda, host of the new PBS science series The Human Spark, talks to podcast host Steve Mirsky about his experiences as a fictional physican, a real patient and an amateur scientist. Web sites related to this episode include www.pbs.org/humanspark

Alan Alda, star of stage, screen and science, talks with podcast host Steve Mirsky about his new PBS science series The Human Spark as well as his strong interest in science and long association with Scientific American

Here are four science stories, but only three are true. See if you know which story is TOTALLY BOGUS.

Scientific American daily podcast contributor Karen Hopkin talks about a few recent studies related to the science of the Christmas season

The Totally Bogus Quiz for this week

ScientificAmerican.com's David Biello is in Copenhagen at the climate conference, and he'll tell us what's going on there. And the Wildlife Conservation Society's Steven Sanderson discusses his Foreign Affairs article, "Where the Wild Things Were," worldwide conservation and the Everglades. Web sites related to this episode include www.snipurl.com/sanderson; www.twitter.com/dbiello

Scientific American magazine Editor in Chief Mariette DiChristina and editor Michael Moyer talk about the "World Changing Ideas" feature as well as other contents of the December issue. Plus, we'll test your knowledge about some recent science in the news

The Totally Bogus Quiz for this week

On the eve of the United Nations Global Warming Conference in Copenhagen and in the wake of the hacked climate researchers' e-mails, former Scientific American Editor in Chief John Rennie discusses his ScientificAmerican.com article "7 Answers to Climate Contrarian Nonsense," available at http://bit.ly/8bg9Fx

On the 150th anniversary of the publication of Charles Darwin's Origin of Species, we review Darwin's influence on the the modern world, as analyzed by Ernst Mayr, one of the 20th century's most prolific evolutionary theorists. We review Mayr's July 2000 Scientific American article, "Darwin's Influence on Modern Thought". The original, complete essay is temporarily available free of charge at http://snipurl.com/darwinsciam

Tree ring expert Kevin Anchukaitis, of the tree ring lab at the Lamont-Doherty Earth Observatory, part of Columbia University's Earth Institute, talks about the information available in tree rings. And Colin Chartres, the director general of the International Water Management Institute, talks to Lynne Peeples about water issues. Plus, we test your knowledge of some recent science in the news, specifically the November issue of Scientific American magazine. Web sites related to this episode include http://snipurl.com/sciamwater; http://snipurl.com/sciamnov