From Publishers Lunch Weekly:
Staton Rabin's DR. MIRACLE, a time-travel adventure about an African-American teenage science whiz from South Central L.A. whose best friend is killed in a gang fight and who hijacks his teacher's time machine to go back in time to the 13th century to try to prevent the invention of gunpowder and guns.
Sold to Margaret K. McElderry Books/Simon & Schuster Children's.