Costco science kit experiment day - mixed results

Grabbed that National Geographic crystal growing kit at Costco ($14.99) on a whim for the kids. Thought it'd be a fun afternoon activity. My 9yo was way into it, set it up perfectly, wrote down predictions, the whole thing. My 6yo lost interest after 10 minutes and went back to iPad. At least one of them is developing patience I guess? Anyway if anyone wants the crystal kit recs, ask me - I've done like 5 of them now.