These Algae Curl Up Into a Ball When They Get Stressed Out

From a channel Lumen includes in full: Journey to the Microcosmos pairs James Weiss's original microscope footage of living microbes with carefully written, sourced narration by Hank Green about their biology and evolution.

A 10-minute video from Journey to the Microcosmos's catalogue; the title names its topic.

Video by Journey to the Microcosmos, played through YouTube's embedded player.