This x-ray fluorescence image shows chemical elements in live seedlings of the nickel hyperaccumulator plant Berkheya coddii. Calcium appears in red, nickel in green, and potassium in blue. Hyperaccumulators extract nickel, cobalt, and other metals from certain soils and incorporate them into their biomass. To find out how the Advanced Research Projects Agency–Energy is exploring the plants’ potential to sustainably mine metals that are critical to clean-energy technologies, turn to the story on page 24 . (Image courtesy of Antony van der Ent/University of Queensland.)