A chemistry professor in a large college had some exchange students in the class. One day while the class was in the lab the Professor noticed one young man (exchange student) who kept rubbing his back, and stretching as if his back hurt. The professor asked the young man what was the matter. The student told him he had a bullet lodged in his back. He had been shot while fighting communists in his native country who were trying to overthrow his country's government and install a new communist government. In the midst of his story he looked at the...