Built to be taught tomorrow
Every investigation is free, needs no student accounts, and comes with the teacher guide, the student handout, and the standards already mapped.
The published investigations are written for grades 9 to 12 Earth Science and Environmental Science, and each can be taught in fifteen, forty-five or ninety minutes depending on how far you take the argument.
Nothing here asks your students to sign in or hand over an address, and nothing collects data about them. If you teach one of these, there is a short form at the foot of the investigation — three questions, two minutes — and what you send back shapes what gets built next.