Book excerpt: How do waves break, and what makes good surf? What are dangerous rip currents, and how do you spot one? What should you do if you get caught in one? Australia’s best-known surf scientist, Rob “Dr. Rip” Brander, takes readers on a fascinating and entertaining journey to uncover how beaches form and behave, the science of waves and currents, and how beaches respond to storms and climate change. He explains where the sand we lay our towels on came from, how the tides that wash up new treasures each day work, why no two beaches are exactly the same, and why some of them are disappearing. He also explores some of the hazards to watch out for, from rip currents to tsunamis to the (unlikely) event you find yourself swimming with a shark. Whether you’re a surfer looking for the perfect wave or you just enjoy hitting the beach with friends and family, this book is a must-read for all ocean lovers.