Colin Pillinger - the man who led Britain's Beagle 2 mission to Mars in 2003 - tells us what he thinks happened to the lander, which fell silent after it separated from Mars Express, and criticises the European Space Agency's role in the project.
Colin is speaking at an event at the Royal Geographical Society on Wednesday 16 March. His book My Life on Mars is out now and was reviewed for the Guardian Science Book Club in December.
In our show and tell section Ian Sample tells us about some highly cultured brain cells that could help in the quest for new treatments for Alzheimer's, Alok Jha discusses how scientists are often ignored during national emergencies, and Robin McKie looks at a new mission to Mercury.
Lester Brown, president of the Earth Policy Institute and a man the Washington Post called "one of the world's most influential thinkers" tells us about the concept of "food bubbles". It's all in his new book World on the Edge.
There are also a few mentions for those of you who got in touch following last week's podcast.
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