According to the Florida Museum of Natural History’s International Shark Attack File, the US recorded 47 unprovoked shark attacks in 2021 — the most in the world. Shark sightings have spiked in a number of coastal areas in recent years, including California and parts of the northeastern US. As new technology and crowdsourcing open a window into the behavior of sharks, Storyful’s explainer breaks down what this means. Reporting by Angelina Fay.