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.
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20190211084732502-0589:S0883769419000368:S0883769419000368_figu1g.jpeg?pub-status=live)
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.
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20190211084732502-0589:S0883769419000368:S0883769419000368_figu2g.jpeg?pub-status=live)
DECEMBER 2018 answer key
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20190211084732502-0589:S0883769419000368:S0883769419000368_figu3g.jpeg?pub-status=live)
Answers will be published in the April 2019 issue.