Photo challenge: what is it?

These images were obtained by Jay Leitch in the Nanoscience Laboratory at the University of Guelph, Guelph, ON using an FEI Inspect S50 Scanning Electron Microscope (SEM). The Nanoscience program at Guelph focuses on teaching students about the unique chemical and physical properties that arise when bulk materials are shrunk down to the nanoscale. The magnification is on the bottom to help you guess. Answers on page 18.

Pollen grain at 12000X magnification.SEM image of human hair at 3000X magnification.

A 3-D blast

Boy running from thermite combustion.More photos from Trish McKee’s outdoor thermite fun (continued from the front cover). Above, the student is in mid-air stride but he could not resist turning around to take a look. Although in the photo he appears closer, he was about 10 meters away. Below is the puff of smoke in the blue sky from the denotation. Trish says the thermite-reaction day is considered by her students to be one of the highlights of her chemistry course.

Not-so-blue skies

Smoke in sky.