Around the world, though, there’s a growing threat to lakes: toxic bacteria which turn the water green. This is the same green as you see on stagnant ponds. It’s caused by tiny organisms ...

ABOVE: The ciliate Pseudoblepharisma tenue harbors both green algae and purple bacteria as symbionts. SEBASTIAN HESS M ore than a century ago, a German schoolteacher named Alfred Kahl made a career ...

If you have a UTI, your urine may appear green because of bacteria called pyocyanin. Green pee may also be an early sign of liver disease or blue diaper syndrome in babies. If you look into the ...

Around the world, though, there’s a growing threat to lakes: toxic bacteria which turn the water green. This is the same green as you see on stagnant ponds. It’s caused by tiny organisms called ...