GZA - a.k.a. “The Genius,’’ a.k.a. Gary Grice, founding member of the Wu-Tang Clan - is known for an omnivorous intellect and complex lyrics that reference astronomy, philosophy, and obscure chess moves. He was in town this week to lecture at the Harvard University Black Men’s Forum. But first, he wanted to drop some science. Specifically, oceanography. And biology. And physics. So he went on tour at Harvard and the Massachusetts Institute of Technology, learning.