SITUATION EXPLAINED: Elon Musk just pledged a SpaceX share to every kid in America, a giveaway worth over $10 billion. • He says this will be "the first of many" • At about $146 a share for roughly 72M kids, that’s about $10.5B, 1.5% of his roughly 4.8B SpaceX shares • That’s nearly double Michael Dell’s record $6.25B gift to Trump Accounts, the government-seeded investment accounts for kids • He hasn’t said who counts as a kid, whether noncitizens qualify, or how the shares get delivered •…