The Moon is falling right now. So is Earth. That's not a typo, it's literally what an orbit is. Free gravity and orbit worksheets for World Space Week, two versions, going beyond "memorize the planets" into concepts usually saved for high school.

Three free async classes this month, no strings attached. An AI robot explaining himself, the real science Ray Bradbury hid inside a short story, and what it would actually take to grow food on Mars.

I read a lot of middle-grade novels looking for the right science hook, and most of them just don't have one. They're good stories, but the science is either missing entirely or stapled on at the end. City of Ember is different. It doesn't just contain science. It's structurally about the loss of it.