This is how a volcano could have caused the massive tsunami that hit the South Pacific island nation of Tonga in 2022: | NOVA l PBS

This 19-year-old was constantly hurting and hungry because of a genetic condition that left him with only 2% body fat. But by combing through over 2.5 billion letters in a special lab mouse's genome, researchers found a hormone that could treat aspects of his condition: | NOVA l PBS

Time isn't always the same for everyone. Here's how Einstein explained it: | NOVA l PBS