https://ift.tt/2wwdHAe The Mysterious Green Orbs That Float by Day and Sink at Night Algae, Biorhythms, Sunlight Known in Japan as marimo, the unusual balls of algae seem to follow a biological clock that helps them pursue sunlight while underwater. JOANNA KLEIN https://ift.tt/2P2y1O9 August 24, 2018 at 05:30AM

By JOANNA KLEIN from NYT Science https://ift.tt/2wpTDfs