My team is developing a 21st century high school course in Algorithmic Geometry. AG explores interdisciplinary Math-Computer Science, where students learn the geometric representations and algorithms underlying engaging spatial apps, such as 3D graphics, multi-limb robotics, GPS positioning, and camera-based navigation. We use a Problem-Based-Learning approach, and with 2-years of public school pilot experience, have fairly remarkable results in terms of the problem sophistication students are able to master (which benefits from the student writing their own Vector Geometry software library in Java). For many students, this is their initial experience with programming, which they find very satisfying. Our assessment tools, custom developed to go with the advanced content of AG, are demonstrating that inventor-level math-CS problem solving is a transferable skill. Lawrence Livermore National Labs was an early supported.