jayk7Getty Images My 3-year-old assumes I’m the world’s most knowledgeable meteorologist. Every day for the last two months, multiple times a day, he asks me things like, “Why is there fog today?” or “Why is it sunny right now, Mommy?” I’m flattered that he thinks I’m such a weather savant, but most of the time I struggle to answer him. It’s not that it’s tough to explain why the sun decided to shine — is “because it wanted to give the moon a break” a good response? — it’s just that fielding toddler “Why?” questions can be exhausting. It’s not always