See if you can find the 8 differences in each set of images.
Mexican cactus
Ceria microstructures with sputtered Au. Scanning electron microscope image at 20 KV, X3500.
Araceli Romero Núñez, National Autonomous University of Mexico, Mexico
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20230706085530958-0664:S0883769415001360:S0883769415001360_figu1g.jpeg?pub-status=live)
April 2015 answer key
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20230706085530958-0664:S0883769415001360:S0883769415001360_figu2g.jpeg?pub-status=live)
Tethered moon
Ultrathin (50 nm) ribbons of brown recluse silk applied to a eutectic Pb/Sn solder ball on Si.
Sean R. Koebley, College of William and Mary, USA
The answers will be in the August 2015 issue
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20230706085530958-0664:S0883769415001360:S0883769415001360_figu3g.jpeg?pub-status=live)