Last login: 7 hours agoDoctormark
Mark is a 68 year old guy from Fullerton, California, USA.
Likes 620 pages, 9 videos, 5 photos • 67 fans • Received 2 reviews
Member since Nov 06, 2007
Welcome to my blog. I'm a retired physics professor with an interest in education. I publish an online journal called The Irascible Professor.

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