I know why Mark Zuckerberg risked live demo failure

​​On Wednesday evening, I had a profound sense of déjà vu. When I watched Mark Zuckerberg open his Meta Connect keynote by giving the world a live backstage tour from his new glasses,

I was transported back to 2012.

I was in the live audience at Google I/O when Sergey Brin introduced the world to some friends about to jump out of an airship, high above the event. I watched, agape, as athletes dove through the sky, launched bikes across the roof, rappelled down the side of the Moscone Center in San Francisco, then strode onto the stage right in front of me – all while streaming the whole thing live from their Google Glass headsets.

We’d nev …

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