A new app puts professional-level concussion diagnosis in the hands of amateur coaches and officials, parents, or anyone with a smartphone.

The Cybathlon is a different sort of competition, in which performance enhancement is not only perfectly acceptable, it’s actively encouraged.

FROM THE ARCHIVE: Derek Miller is dead, to begin with. There is no doubt whatever about that—because Miller himself told us. His final words, uploaded posthumously by a close friend on May 4, 2011, were both pithy and poignant: “Here it is. I’m dead, and this is the last post to my blog.” He was 41.

Dramatic. Momentous. Revolutionary. Earth-shattering. Such peacockery has typically been confined to Hollywood puff pieces and high-tech product launches, until now.

To co-founder Joe Gebbia, what Airbnb is actually selling is a kind of antidote to a peculiar sense of 20th century alienation.

Did you feel that? That little stretch as your legs pulled away from your body, that little squeeze as your sides squished together for a fraction of a moment?