The Obama Administration has rejected re-structuring plans from GM and Chrysler, forcing GM's CEO to resign and putting both companies on a short time line to re-make themselves or face bankruptcy and sale. We'll speak with Justin Hyde, Washington DC correspondent for the Detroit Free Press.

Simon Johnson is former chief economist at the International Monetary Fund, who was dispatched to help save many failing economies. He says the US economy resembles other collapsed systems, including Argentina and Russia. He argues that smashing the financial oligarchy here is the only way to fix the banking system. Johnson is an MIT professor and senior fellow at the Peterson Institute for International Economics. He writes an influential blog called "The Baseline Scenario."

Six volunteer astronauts from Russia, France, and Germany will take part in an experiment to see if human beings would be able to withstand the two-year journey to Mars and back. The volunteers will begin the second stage of the experiment tomorrow in Moscow. They will be locked inside a mock spaceship module until July. The BBC's Richard Galpin reports.

Salvia Divinorum is a hallucinogenic herb that is legal in many states and readily available online. It's also becoming popular with teenagers. Some lawmakers want to ban its use; while researchers say it may hold promise in the treatment of pain, depression, and addiction. We talk with John Mendelson, a pharmacologist at the California Pacific Medical Center Research Institute; he is studying salvia divinorum's impact on humans. We also hear from Kathleen Chidester of Wilmington, Delaware. She blames her 17-year-old son's suicide on his salvia use and says it should be banned nationwide.

Earth, Wind, and Fire's lead vocalist, Philip Bailey joins us to talk about that unmistakable falsetto voice of his which was at the center of such hits as "Reasons", "Fantasy" and "After the Love has Gone".