Barry E. DiGregorio is a freelance writer in Middleport, New York, who writes for IEEE Spectrum, New Scientist, Chemistry & Biology, ASM Microbe Magazine, and other scientific publications. He is also author of Mars: The Living Planet (North Atlantic Books). He wishes to thank William Suitor for his assistance in the preparation of this article and for the use of his collection of photographs.
Barry E. Digregorio
