This week we get Naked in Norway as we visit the University of Oslo to reveal the remains of ancient plesiosaurs and investigate their migration into water, discuss a new concept for more efficient solar cells and discover the fatal effects of climate change on lemming population cycles. We then scour more Scandinavian science to unearth the causes of mass extinction, find out a new way to overcome resistance to radiotherapy, tool around with chimps in the Savannah and round up with a scientific climax in bird masturbation!