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Nasa scientist Steve W Squyres describes what it's like to man the controls of Opportunity and Spirit, the two planetary exploration rovers that are exceeding expectations as they search for signs of life on the surface of Mars
Discovery: Meet Dr Clyde Snow, the father of forensic anthropology, who worked on the John Wayne Gacey murder case in the US, testified against Saddam Hussein, and almost found the remains of Butch Cassidy and the Sundance Kid in Bolivia
Nasa astronaut Mike Foale has spent more than a year in space, racking up stints at the Hubble Telescope, Mir and International space stations. He shares his unique experiences of life in zero gravity
An investigation into what happens when we die is taking place in hospitals across the UK and US. Dr Sam Parnia, who heads the study, explains how he will record the out-of-body experiences of 1,500 patients
The large hadron collider at Cern is almost ready to start smashing open particles and expand our understanding of the universe. Paul Collier, who has been working on the machine, explains the mechanical challenges
UK-based medical doctor Paul Trümpelmann has just scaled Mount Everest. Having battled frostbite and altitude sickness, he describes the physical and mental challenge of making it back alive
