GRIP Lab at University of Michigan provides infrastructure for the GeT: A Pencil community and organizes the GeT: A Pencil online seminars. These free, interactive seminars are an opportunity to exchange knowledge and information among community members and colleagues.
Geometry in the Common Core State Standards
How to Build Basic Logic on the Foundation of Mathematical Categories and Language
The geometry of sunlight: An examination of naturally occurring parallel lines and the mathematical investigations they inspire
Transformational geometry, one part of transforming geometry instruction
Secondary Geometry for Mathematicians and Educators
Teaching Geometry for Teachers in the Time of Covid-19
Diagrams in Euclidean Geometry: Logical, Philosophical, and Pedagogical Considerations
Animated Contrasting Cases in Geometry (AC2inG): The Design of New Geometry Curricular Modules
What geometry should secondary teachers learn, and what geometry should they teach?
Actively Building Geometry from the Ground Up
Reporting on the MKT-G Results from the GeT Students
Experiencing Hyperbolic Geometry