What did the oceans look like 450 million years ago? Who were the weird and whacky ancestors of the sharks we know today? And could megalodon still exist? This week we're going back in time to answer all these questions and more at the Natural History Museum in London, with curator of fossil fish Emma Bernard!  Find out more about Emma and the Natural History Museum here: https://www.nhm.ac.uk/our-science/departments-and-staff/staff-directory/emma-bernard.html. Read her fintastic article about Megalodon here: https://www.nhm.ac.uk/discover/megalodon--the-truth-about-the-largest-shark-that-ever-lived.html.  You can follow the Save Our Seas Foundation by heading to @saveourseasfoundation (instagram), @SaveOurSeas (twitter) or by heading to www.saveourseas.com. And find the shownotes for this episode at www.saveourseas/worldofsharks/thewholetooth.