Maybe you already knew that deadly algal tides discolor ocean waves, deplete the water of oxygen, and release toxins that can kill a huge range of ocean critters, but did you know that the tiny organisms that cause red tides are also an extremely important part of our ecosystem? In this episode of Untold, a new YouTubeLearning series from ACS, PBS, and YouTube, we dive into the science behind this somewhat terrifying, sometimes glowing phenomenon.