A Conversation with Ocean Explorer Bob Ballard: In this segment, Ira talks with undersea explorer Robert Ballard about his life and work, both in exploration and education. (first broadcast Friday, July 3, 2009)

The Disappearing Mississippi Delta: Rising sea levels and not enough sediment replenishment may make much of the Mississippi Delta 'drown' by the year 2100, according to a new study. (first broadcast Friday, July 3, 2009)

Some Projects to Try on Your Summer Vacation (Or Perhaps Not): We'll give you some ideas for safe -- and not so safe -- science experiments that you may be tempted to try at home. (first broadcast Friday, July 3, 2009)

A New Type Of Black Hole : Researchers may have discovered a new type of black hole, a finding that would mean the massive gravity sinks can exist in a 'medium' size. (first broadcast Friday, July 3, 2009)

Summer Science Movies: We'll talk about the art and science of several films out this summer, from documentaries chronicling an astronomy project, to a mass-market blockbuster featuring antimatter in a supporting role. (first broadcast Friday, June 26, 2009)

Oil from Diatoms: Is it possible to engineer diatoms to secrete oil? (first broadcast Friday, June 26, 2009)

Wind Energy Potential: A new report says wind turbines have the potential to supply all the world's energy needs. (first broadcast Friday, June 26, 2009)

Hydrogen Storage in Chicken Feathers?: Researchers say they've come up with a new material for storing hydrogen fuel -- carbonized chicken feathers. (first broadcast Friday, June 26, 2009)

Same-Sex Behavior in the Animal Kingdom: A review of the literature suggests that same-sex behaviors may occur in many animal species. (first broadcast Friday, June 19, 2009)

A Package of Dad's Genes: Just in time for Father's Day, we'll talk with a researcher studying the way genetic information is packaged inside sperm cells. (first broadcast Friday, June 19, 2009)

Summer Sky Guide: Summer nights are made for stargazing. We'll get a guide to what to look for in the skies in the months ahead. (first broadcast Friday, June 19, 2009)

Health Care Reform: The White House is trying to push forward its plans for reform of the US health care system, with President Obama giving a speech to the American Medical Association outlining parts of his proposals. In this hour, we'll try to sort out the options. (first broadcast Friday, June 19, 2009)

Why Do We Have Fingerprints?: The standard answer is that fingerprints increase friction, improving the grip of the fingertips. New research, however, says that may not be the case. (first broadcast Friday, June 12, 2009)

The Life and Legacy of Stanley Milgram: We'll talk about the life and contributions of the pioneering social scientist. (first broadcast Friday, June 12, 2009)

Raising a Stink over a Flower in Bloom: Botanists expect a very rare, very large, and very stinky flower to bloom this week in California. (first broadcast Friday, June 12, 2009)

New Views of the Universe from Herschel and Planck Telescopes: Two new space telescopes are en route to their post over 1.5 million km from Earth. We'll talk about the ESA's Herschel and Planck observatories. (first broadcast Friday, June 12, 2009)

Colliding Planets (Don't Panic): New research finds a small -- but present -- chance of a collision between Earth and one of its planetary neighbors in the next few billion years. (first broadcast Friday, June 12, 2009)

Moon Missions Preview: If all goes according to plan, two spacecraft will launch en route to the moon next week. We'll get an update on the LRO and LCrOSS missions. (first broadcast Friday, June 12, 2009)

Cancer Vaccine Update: We'll hear about new research into using vaccines to help the body battle melanoma. (first broadcast Friday, June 5, 2009)

Newton and the Counterfeiter: Isaac Newton is known as one of the world's greatest scientists, developing the three laws that define the way motion works. But did you know that he had a second life fighting crime? (first broadcast Friday, June 5, 2009)