Marge: Bart, I Feel So Bad For Going So Many Years Without.

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Marge: Bart, I feel so bad for going so many years without... mmm...
mmm... What's that word where you encourage something to grow?
Bart+Homer: [stare blankly and hum "I dunno"]
Lisa: [brightly] Nurturing.
Marge: ... nurturing your brilliant brain.
-- "Bart the Genius"