Sir David Attenborough chats to a tawny owl during filming of the second series.
Two biologists find out how nature's giants evolved and how they function.
Simon Reeve takes to the high seas for a trip around the edge of the Indian Ocean.
Ben Miller reflects on the similarities between evolution and comedy.
Greg Foot answers some of the most bizarre science questions, like why is chilli hot?
Get your wellies on at Glastonbury, trek to Machu Picchu or raft the Grand Canyon.
Browse through some beautiful images of our wonderful planet.