Mek'leths at Dawn (Discovery S1E9)

When Starfleet asks for the U.S.S. Discovery to stand down at Pahvo, Lorca decides that instead he'll have his crew crack T'Kuvma's math. But when Burhnam and Tyler sneak around the Klingon death ship, Ash finds himself trapped by P.S.T.D. Can Bob help them escape? Why doesn't L'Rell wear safety glasses? Can Stamets survive 133 live Phish songs?

It's the episode that solves one universal problem, while cloaking another.