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
December 2016 answer key
When the flame goes out
Copper salt residues.
Susan A. Odom, University of Kentucky, USA
Answers will be published in the April 2017 issue.