"Well, yes, obiously now I can." He rolls his eyes.
He nods at Ianto and the other Doctor. "That's what I've been doing most of the last year for our Torchwood. Identification. Though, being an alternate universe, there were things even I'd never seen before."
He sighs, running a hand through his hair. "Energy booster. Alien tech. Not entirely sure which aliens, it was one of those pieces that was new to me. But I was able to figure it out. It amplied everything you would normally do to grow one, it amplified everything Donna suggested, it increased everything exponentially." He pauses, "Including the connection between the growing TARDIS and her pilots, since I'd already infused our DNA into her..."