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perovskite diagram

LAYER UP  Researchers are betting on a class of sunlight-absorbing materials called perovskites to improve today’s solar cells. A perovskite’s cagelike crystal structure (right) surrounds a chunky ion such as methyl­ammonium. The red, purple and orange balls are ions that can be varied so the material absorbs different wavelengths of light in its 3-D form (left).

illustration of seismic waves under a mountain

NUCLEAR SHAKEDOWN  Rumblings of seismic waves reveal clues about North Korea’s nuclear weapons tests, detonated in a mountain.

diamondback moth

NOM NOM NOM  In their caterpillar phase, diamondback moths can wreak havoc on a cabbage patch. A newly approved field trial aims to test whether a GM strain could reduce their damage.

Earth & Environment

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