Dr Helen Scales is a marine biologist, writer and broadcaster. When she's not on or beneath the waves, she writes and talks about the connections between people, science and the living world. Among her BBC radio documentaries she's explored the dream of living underwater and searched for the perfect wave. She teaches at Cambridge University and advises the charity Sea Changers to help safeguard the UK's marine life. Her books include 11 Explorations into Life on Earth about the Royal Institution Christmas Lectures, and the Guardian bestseller and BBC Radio 4 Book of the Week Spirals in Time.