Sharon listens closely, then nods – it's a little like trying to follow Dr. Selvig as he starts waxing rhapsodic about wormholes.

"You know there's a limit to the end of that spectrum, right?" she asks him. "Morally, if not physically."

Nurse Hart's jaw sets, but she says nothing; somehow Sharon thinks she's already made that connection. One of the lab assistants is blushing. Sharon ignores him to keep her eyes on Howard.