Right. Charles uses it to amplify his telepathy to find other mutants, mostly. Though he's used it to speak to people, too.

But - mm, word of mouth would certainly get the word out. [the thought that there were enough mutants for that to be efficient, though . . . it amazes him, a little. He knows that there's more out there in his world, but back when they first began looking, there weren't a lot at all. At least, not that Charles could find at the time.

Another reason to reconnect with the world back home, he thinks]

It sounds nice. Ah - hearing that mutants know about the school in your world, I mean.