This week Alok Jha meets Professor Andrea Sella ahead of his event at the Royal Institution in London on 31 May. Andrea, who is a professor of materials and inorganic chemistry at University College London, discusses the chemical wonder and power of the 14 rare earth metals. To book tickets for his event click here.
Alok is joined by Guardian science correspondent Ian Sample and Observer science editor Robin McKie to discuss the happy news that Major Tim Peake has made it through the intensive astronaut training at the European Space Agency and will be heading to the International Space Station in 2015.
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