His name is Spencer. But everybody calls him “Spence.” He was a state track champion in high school; then he went on to attend a prestigious university on a full academic scholarship. He lives now in one of America’s largest cities and is highly respected in the field of chemical engineering. But if you were to ask Spence his greatest achievements to date, he wouldn’t mention any of those things. He would excitedly tell you about the trips he makes to Nicaragua every few months to check in on the kids and teachers in the tutoring program he helped establish…