This month I’m going back to programming for a while. I need a rest from the weirdness on the Talkback discussion in last month’s column. I do intend to write more about theory issues in the future, ...

Puff and Suck (or Sip and Puff) systems allow people with little to no arm mobility to more easily interact with computers by using a straw-like unit as an input device. [Ana] tells us that the usual ...