Two and a half years, from skid to publication. That's a record for the Teach Me project! Other records: first RAM upgrade for MacBook Pro, first multiple camera shoot, first appearance on camera (other than my hands), first titled thumbnail, first collaboration with the police, most audio effects, most video color corrections, and most revisions (previewed and critiqued by a half dozen colleagues). Here's hoping that folks looking to learn about kinetic friction find this video!