There’s a big street fair today in Princeton. To add a science outreach presence to the event, my officemate, Mike Heppler, and I teamed up yesterday to build a simple projecting refractor telescope out of surplus optics and cardboard. It works surprisingly well, and we hope to show many people today their first (and safe!) view of the Sun’s surface. More photos, and complete instructions to build your own cheap sun projector will be posted here soon!