Researchers study raindrops in order to help preserve clean water supplies; and Bay Area physicists use ground-breaking particle accelerators to discover what's inside the atom. Also: a tide pool's menagerie.
Rebuilding North Carolina's deteriorating oyster reefs; battling algae blooms in Lake Erie. Also: a dam-removal project in Washington state that will help salmon flourish; an Ohio artist who creates art from coal mine run-off.
Innovations in producing and maximizing food resources. Included: a Milwaukee farmer who feeds a growing urban population; strategies for reducing food waste; a North Carolina facility that turns cooking grease into fuel; and gardens on wheels in Omaha.
The hunt for black holes with NASA's NuSTAR telescope; what's being done about plastic trash in the Pacific Ocean. Also: motion-activated cameras shed light on the lives of animals at Stanford's Jasper Ridge Biological Preserve.