Unlocking the secrets of bacterial biofilms – to use against them

Standing on a walkway at Yellowstone National Park, I admired the hues of orange, blue and yellow in the sand of the Grand Prismatic Spring. A small sign nearby read "bacterial mats." Visitors to Yellowstone may have noticed similar signs all over the park, but they're often overlooked on the way to waterfalls, geysers, hot springs and more.