Animals that make their living outside the box

(Feb 11, 2021) In general, plants make food from sunlight, and animals fuel themselves by "burning" oxygen. But some animals think outside the box. Curt Stager and Martha Foley look at a photosynthetic slug that hijacks the genetic machinery of the algae in its diet, and at a jellyfish that needs no oxygen, burning the alternative fuels of hydrogen and sulfur.