Destin Wilson Sandlin (born September 17, 1981) is an American engineer and science communicator. He is widely known for creating and hosting the educational YouTube channel "Smarter Every Day," which he launched in 2007. Sandlin's channel features explorations and explanations of scientific concepts using slow-motion photography, experiments, and engaging demonstrations. Episodes often begin with a question and explore the world to find the answer, encouraging viewers to observe, learn, and ask questions.
Sandlin has a Bachelor's degree in Mechanical Engineering from the University of Alabama and a Master's degree in Aerospace Engineering from the University of Alabama in Huntsville. Until late 2018, he worked as a full-time missile flight test engineer at Redstone Arsenal. In early 2016, Sandlin was chosen as one of three YouTube personalities to interview then-President Barack Obama after his final State of the Union address. Besides "Smarter Every Day," Sandlin runs the YouTube channels "The Sound Traveler" and "Smarter Every Day 2," and co-hosts a podcast called "No Dumb Questions" with Matt Whitman.