Pipes and wiring. They didn't have any of the latter at Hogwarts and he'd never bothered much with the piping. But he recognized the potential there. He nodded. "Ah, not a bad name for it."

When he saw Saturday's reaction to the nanochains, he almost felt bad for focusing on it. But it was something they should talk about if they wanted to get rid of them. Sirius felt divided about staying but that damn thing had to go.

"I thought it was magic or technology. They seem to be very against Stuff here. If Stuff is as unpredictable as they say, I don't believe it's stable enough for them to put it in us. Not safely." If and safely being the key words because Sirius didn't buy everything they said and as for safety... well, they'd demonstrated how much they cared about their well being.