Researchers have found new examples of the strange singled-
celled creatures called xenophyophores more than six miles
beneath the surface of the Pacific in the Mariana Trench. At
more than four inches in length, they are perhaps the largest
single-celled organism on Earth. These protists make a living by
sifting through sediments and can accumulate high levels of
toxic metals like uranium, lead, and mercury. Read more at
LiveScience. Image: Lisa Levin & David Checkley, Scripps
Institution of Oceanography