In this edition of Science Weekly, zoology author and blogger Henry Nicholls explains how rising and falling sea levels have affected the evolution of species on the Galapagos Islands. He also reviews progress in the epic battle to preserve the islands' unique wildlife, which inspired Charles Darwin to formulate his famous theory.
Henry is the author of a newly published book, The Galapagos: A Natural History.
Ian Sample, the Guardian's science correspondent, is joined by Observer Tech Monthly commissioning editor Nicola Davis and Guardian environment writer Jessica Aldred to discuss some of this week's science news – how humans have managed to deposit litter in the deepest parts of the ocean; a breakthrough in male fertility using stem cells created from skin to make sperm cells; and the importance of plant seed banks such as Kew's Millennium Seed Bank to ensure the security of global food supplies.
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