They create new geological features and show us things we didn't know existed. In addition to these things, they also push us to rethink and invent new technologies to help reduce lives lost to tsunamis. In recent years, there have been so many different technologies to help protect people from tsunamis. There are devices that can sense an earthquake is coming, devices that can predict when an earthquake might occur, and even devices that can detect how bad it might be. For example, Dart (ocean depth assessment and tsunami reporting) buoys help maintain and improve the early detection and real-time reporting capability of open ocean tsunamis. The DART system consists of buoys placed in strategic locations throughout the world's oceans. These technologies have saved many lives and will continue to save them in the future. Thanks to tsunamis we can also find new information about our world and how things work that we don't see on a daily basis. For example, we now know plate movement under the ocean that would never have been discovered if we didn't have tsunamis to observe. Furthermore, some cities submerged under water, considered “lost cities”, were rediscovered due to tsunamis. Scientists continue to research and learn more about tsunamis and how they work every day. And because of past tsunamis, we now know the necessary precautions to take to stay safe when a