August 2013 (101st anniversary of discover) update: Microscopy Today (July 2013 edition) published my article on cosmic ray particles imaging. Please see

http://onlinedigeditions.com/publication/?i=167312

Cosmic rays image shows 83.33 hours of cosmic ray particles striking a Hamamatsu ORCA-ER digital CCD camera. Each of the three color channels are 10,000 exposures, 10 seconds each. Camera background has been removed and gamma adjusted for better contrast. August 7, 2012, marks the 100th anniversary of the discovery of cosmic rays. I was employed at University of Miami at the time of the image acquisition.

— George McNamara, PhD, M.D. Anderson Cancer Center.

My thanks to Optics & Photonics News, Optical Society of America, for posting this as the image of the week for the week of August 8, 2012. The OPN Image of the Week gallery is at

http://www.osa-opn.org/home/gallery/image_of_the_week.aspx

For more on Victor Hess's discovery of cosmic ray particles, see

http://en.wikipedia.org/wiki/Cosmic_ray