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Earth

Cellulose Dreams

Turning cellulose from plants into ethanol for fuel could help lower greenhouse-gas emissions—but the conversion is far from straightforward.

Humans

From the August 14, 1937, issue

Trees inspire a new kind of architectural support, a university sophomore finds the first mosasaur fossil west of the Rockies, and an oilman scoffs at fears over increasing atmospheric carbon dioxide due to industrial activity.

Animals

Worm Lovelies

Polyclad flatworms are soft, juicy, and delicate coral-reef dwellers. To avoid predation, many have evolved brilliantly hued coloration. It’s a trait that often signals a critter is toxic, as many of these worms indeed are.