See if you can find the 8 differences in each set of images.
Nano-stingray
Scanning electron micrograph of an epoxy-nanocomposite fracture surface reminiscent of a stingray gliding through the ocean. The carbon nanotube tail acts as a high-strength deterrent, enhancing durability against attack from predators.
Cate Brinson and Marc Palmeri, Northwestern University, USA
Feather and fan
This otherworldly landscape is a polarized microscopy photograph of a perylene derivative thin film. This technique allows the light to pass through crystalline areas of the imaged film, while amorphous regions remain dark. The combination of this technique and Nature's talent to assemble organic crystals creates an abstract tableau that resembles feathers, fans, wings, and gems.
Françoise Provencher, Université de Montréal, Canada
Answers will be in the June 2011 issue
February 2011 answer key