Errata
Typographical and other assorted minor corrections to the published manuscript are found here:
Page 190
The most important subjects are in the middle of the view when you point and shoot your handheld camera or digital device.
Page 228
DMs are preferable to tapping chip cards on a paybox, or apps that transfer funds started by the payer with a password.
Page 268
... tire irons; a helmet; a digital unit mount; a spoke wrench; ...