The kid can count to 20 in one breath, and she can add and subtract numbers up to 4. But every once in a while, it really hits home, the difference between these kind of toddlery parlor tricks and a full, internalized mastery of the concept of numbers.
We were taking a little breather, watching The 'Street, and as the credits were rolling, I told the kid she could watch Sprout for five more minutes, then we'd head out to pick up some dinner.
She counteroffered immediately: "No. three minutes."