See if you can find the 8 differences in each set of images.
The crystal road
Gold droplets on a gallium arsenide substrate struggle beneath a thin coating of silicon dioxide that inhibits crystal growth. An oxide-free corridor leads to a scarlet eruption of gold-tipped gallium arsenide crystals during metal–organic chemical vapor deposition.
David J. Dvorak, Simon Fraser University, Canada.
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary-alt:20171010091701-42931-mediumThumb-S0883769417002305_figu1g.jpg?pub-status=live)
August 2017 answer key
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary-alt:20171010091701-50752-mediumThumb-S0883769417002305_figu2g.jpg?pub-status=live)
Dessin
Core–shell germanium nanowires.
Kevin Guilloy, Aarhus University, Denmark.
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary-alt:20171010091701-13985-mediumThumb-S0883769417002305_figu3g.jpg?pub-status=live)
Answers will be published in the December 2017 issue.