Earth: A Primer

A science book/app for playful people

This is clearly the future of books. So pumped to see this kind of thing become more common :)
Looks awesome! When can we expect "Solar System - a primer"?
Love the idea of being able to interact with the Earth in a "physical" way. I'd like to get my fingers on it but €9,99 is too much for a try. It'd be interesting know their view on pricing.