Lucy can't stop herself from laughing. Traveling through time has made her aware that the technology she's so used to should not be taken for granted. Anything from electricity to sewage to running water were things she's had to deal with. Lucy doesn't think herself a vain person but being in places where she can't shower or has to use the bathroom in the most natural of ways is hard.

So, while she laughs, it's not at him. It's at the way he's stated such a simple fact and that even though she's not traveling through time, different time periods seem to be traveling right at her.

"Happy to," Lucy says, nodding. "Don't worry too much about not understanding cell phones. I've had one for years and I still forget what all it can do. It takes some getting used to. But, it's handy to have."