Video: The pond scum that can kill
Thursday, June 2, 2016 - 18:31
in Earth & Climate
You've probably seen that pesky greenish stuff floating on lakes and ponds. Usually this pond "scum" is just a nuisance. But sometimes it is a horde of cyanobacteria—also known as blue-green algae—that can blossom into a harmful algal bloom capable of releasing all sorts of deadly poisons into the environment.