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Chemistry

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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).

radiation sign

WRITING ON THE WALL A new type of radiation detection could make it much harder to keep radioactive material under wraps.  

painting of Caesar’s last moments

OUT OF BREATH  Caesar’s last moments have inspired much scientific thinking, as well as a new book.

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