Front Cover:
The Aurora Borealis, or Northern Lights, shines above Bear Lake in Eielson Air Force Base, Alaska.  Source: United States Air Force photo by Senior Airman Joshua Strang.

Back Cover:
A quasi-crystal formed by a complex metal alloy: it lacks any long range order from http://www.pi2.uni-stuttgart.de (University of Stuttgart).

Front Inside Cover:
Alfred Nobel, chemist, engineer and inventor, who instituted the prestigious Nobel prizes in various fields of Science, Literature and Peace.

Back Inside Cover:
Snow leopard (Uncia Uncia), a high mountain dweller of the Asian mountains, which is currently endangered.