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
April 2015 answer key
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