Concern over a new hip-hop curriculum that refers to the founding fathers as "old dead white men" has delayed the program's rollout for at-risk students, Oklahoma City Public Schools Superintendent Karl Springer said. "We're making sure that whatever we do, first, we do no harm," Springer said. "The science behind the concept is wonderful. There may be some things, though, that are inappropriate that we need to be careful about." Known as Flocabulary, the program is a music-based educational tool that uses raps, rhythms and rhymes to help students learn and memorize everything from vocabulary and English to math and...