I was holding [my four-year-old daughter] and I said, ‘Sophia, I love you more than anything in the universe.’ And she turned to me and said, ‘Daddy, universe or multiverse?’

Source: "Is Our Universe the Only Universe?" TED2012. Feb. 2012. Conference Presentation. Additional Information: This cute anecdote is from physicist Brian Greene's fascinating 2012 TED Talk about the possibilities of multiple universes other than the one we know. Presumably, Greene's young daughter knows the term "multiverse" (the hypothetical collection of all universes that exist) because her father studies and writes about this subject. Watch the full TED Talk here: Brian Greene - Is Our Universe the Only Universe?

“Is Our Universe the Only Universe?” TED2012. Feb. 2012. Conference Presentation.