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 ],
 "captions": [
  {
   "at": 0.0,
   "text": "The ball hangs still under the carriage."
  },
  {
   "at": 0.4,
   "text": "The carriage rocks back and forth in time with the swing, and each rock makes the swing bigger."
  },
  {
   "at": 2.95,
   "text": "Tick: the ball strikes the steel plate."
  },
  {
   "at": 3.45,
   "text": "Tock: it bounces across and strikes the wood block."
  },
  {
   "at": 3.94,
   "text": "The catch: the carriage slides over the ball just as its swing runs out, and the ball stops dead."
  },
  {
   "at": 4.74,
   "text": "Then it glides back to the middle, at a pace that leaves the ball hanging still."
  }
 ]
}