The world's biggest patch of seaweed

The world's largest patch of seaweed appears every summer in the mid-Atlantic. And since 2011, the Great Atlantic Sargassum Belt has been growing to even more monstrous sizes - thousands of kilometres long - and it's been clogging up beaches along the Americas with metres of stinking brown goo. Now, scientists in Florida and Georgia have used satellite tracking to figure out what's going on - as Phil Sansom explains... Like this podcast? Please help us by supporting the Naked Scientists