See if you can find the 8 differences in each set of images.
Clovers
A high-resolution scanning electron microscope image of zinc oxide “nano-clovers” synthesized by chemical vapor deposition.
Xin Yin, University of Wisconsin—Madison, USA
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary-alt:20170203110713-34467-mediumThumb-S0883769417000239_figu1g.jpg?pub-status=live)
December 2016 answer key
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary-alt:20170203110713-40235-mediumThumb-S0883769417000239_figu2g.jpg?pub-status=live)
When the flame goes out
Copper salt residues.
Susan A. Odom, University of Kentucky, USA
Answers will be published in the April 2017 issue.
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary-alt:20170203110713-43695-mediumThumb-S0883769417000239_figu3g.jpg?pub-status=live)