![Cal Armstrong](https://miro.medium.com/v2/resize:fill:96:96/0*FbXvUJts8SH7mfAo.jpeg)
Cal Armstrong
Cal Armstrong hasn't written any stories yet.
Cal Armstrong hasn't written any stories yet.
I learn; I help others learn / Microsoft Education Fellow / Mathematics Educator / PCMI - Institute for Advanced Study Instructor / Aux Police Constable