Love this thread! I finally finished reading all the posts and can't believe how amazing these kids are. Here's my little brag:

My DS3.5 is currently obsessed with the solar system and outer space. He knows all the planets by name and order, plus a lot of facts about each one, and about other things as well, such as comets and asteroids. Most of the books out there still list Pluto as a planet, so we've had quite a few discussions about how it's not an official planet any more (he's very sad about this). A couple of weeks ago, he came up to me and said, "Pluto isn't a planet, it's a comet. It's made of ice and rock and it's not a planet so it's a comet."

Just thought it was neat how he took what he knew about Pluto and comets and came to his own conclusion.