The Benguela region, off the coast of Namibia, is a shadow of its former self. In the first half of the 20th century, it was one of the world’s most productive ocean areas and supported a thriving ...

Algae creeps in, uneaten food settles, and suddenly your crystal-clear tank looks more like a swamp. But what if you could recruit a team of aquatic janitors to help with the dirty work? Good news: ...