She'll give him a couple minutes just to go through the magazine - giving the boy a break, because she DOES know she just did a big ol' infodump there.

"Yep."

As for why?

"That's just a matter of course, I think; we don't exactly get a primer on what the void is when we arrive. As for those other worlds... some places are pretty self-centric, thinking themselves the center of life in whatever universe, so when someone else shows up with definitive proof, well."

Tidus can probably imagine.

"Wizardry's a secret on the Earth I'm from, overall, and that's because most societies there aren't ready to handle the paradigm shift. Telling them about void travel would be similar in scope, and consequence."