See if you can find the 8 differences in each set of images.

Micro-astronaut on the dark side of the bismuth oxide moon

A thin film of bismuth oxide formed by pyrolysis spray on Corning glass. The image was obtained using scanning electron microscopy.

A. Bernal-Díaz, Universidad Nacional Autónoma de México, Mexico.

figure 1

Hybrid organic–inorganic perovskites

A methlyammonium lead iodide perovskite single crystal. This symmetrical crystal is 150 microns in size and was precipitated from a solution of methylammonium iodide and lead iodide dissolved in propylene carbonate.

J. Clay Hamill Jr. and Yueh-Lin Loo, Princeton University, USA.

figure 2

DECEMBER 2018 answer key

figure 3

Answers will be published In the April 2019 issue.