Sadly, Picard isn't terribly familiar with The Sound of Music. But even without knowing that she's mimicking something from a movie, it's clear enough that the news is good news to Sam. And it's not really any surprise either. He might not be the greatest at knowing what it was like before the Earth as a whole got behind using the metric system, but from what little he can recall of his history classes it had been quite the mess. Or at least highly inconvenient, and he can't imagine what it would have been like to need to remember the conversation ratios on a regular basis.

"There's nothing wrong with that."

Science is definitely important, even simply in general, and he's hardly about to say that she can't have opinions about whatever should happen to matter to her. Or even about things that don't particularly matter to her, but he has a feeling that science is more likely to be the former, in this case.