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      "utf8": "The earliest time measurements were"
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    "segs": [ {
      "utf8": "and season to season to build calendars."
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    "segs": [ {
      "utf8": "More precise time-keeping, like sundials"
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      "utf8": "and mechanical clocks, eventually came along"
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      "utf8": "to put time in more convenient boxes."
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    "segs": [ {
      "utf8": "But what exactly is it that we’re measuring?"
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    "segs": [ {
      "utf8": "Is time something that physically exists,"
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    "segs": [ {
      "utf8": "or is it just in our heads?"
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    "segs": [ {
      "utf8": "At first the answer seems obvious—"
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    "segs": [ {
      "utf8": "of course time exists;"
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    "segs": [ {
      "utf8": "it constantly unfolds all around us,"
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      "utf8": "and it’s hard to imagine the universe without it."
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      "utf8": "But our understanding of time started"
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      "utf8": "His theory of relativity tells us that time"
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    "segs": [ {
      "utf8": "like those travelling close to the speed of light"
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    "segs": [ {
      "utf8": "or orbiting a supermassive black hole."
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      "utf8": "Einstein resolved the malleability of time"
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    "segs": [ {
      "utf8": "by combining it with space to define space-time,"
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    "segs": [ {
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    "segs": [ {
      "utf8": "Einstein’s theory seemed to confirm that time"
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    "segs": [ {
      "utf8": "is woven into the very fabric of the universe."
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  }, {
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    "segs": [ {
      "utf8": "But there’s a big question it didn’t fully resolve:"
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      "utf8": "why is it we can move through space in any direction,"
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  }, {
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    "segs": [ {
      "utf8": "but through time in only one?"
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    "segs": [ {
      "utf8": "No matter what we do, the past is always,"
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  }, {
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    "segs": [ {
      "utf8": "stubbornly, behind us."
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  }, {
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    "segs": [ {
      "utf8": "This is called the arrow of time."
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    "segs": [ {
      "utf8": "When a drop of food coloring is"
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      "utf8": "we instinctively know that the coloring"
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      "utf8": "will drift out from the drop,"
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  }, {
    "tStartMs": 122206,
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    "segs": [ {
      "utf8": "eventually filling the glass."
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    "segs": [ {
      "utf8": "Imagine watching the opposite happen."
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    "segs": [ {
      "utf8": "Here, we’d recognize time as unfolding backwards."
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    "segs": [ {
      "utf8": "We live in a universe where the food coloring"
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    "segs": [ {
      "utf8": "In physics, this is described by"
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      "utf8": "the Second Law of Thermodynamics,"
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    "segs": [ {
      "utf8": "which says that systems will gain disorder,"
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    "segs": [ {
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      "utf8": "Systems in our universe move from order to disorder,"
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    "segs": [ {
      "utf8": "and it is that property of the universe"
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      "utf8": "So if time is such a fundamental property,"
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      "utf8": "We currently have two sets of"
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      "utf8": "One of the biggest goals in theoretical physics"
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      "utf8": "over the last half century has been reconciling"
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      "utf8": "the two into one fundamental “theory of everything.\""
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      "utf8": "There have been many attempts"
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    "segs": [ {
      "utf8": "Oddly enough, one contender called the Wheeler-DeWitt"
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    "segs": [ {
      "utf8": "if it or a similarly time-starved equation"
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      "utf8": "turned out to be true, would that mean"
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      "utf8": "Could time just be some sort of illusion generated"
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      "utf8": "Each individual water molecule doesn’t have a tide,"
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    "segs": [ {
      "utf8": "A movie creates change through time by using"
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    "segs": [ {
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    "segs": [ {
      "utf8": "Flipping through the images fast enough,"
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      "utf8": "our brains perceive the passage of time"
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      "utf8": "from the sequence of still images."
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      "utf8": "No individual frame of the movie changes"
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    "segs": [ {
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    "segs": [ {
      "utf8": "but it’s a property that comes out of how"
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      "utf8": "Could the physics of time somehow be a similar illusion?"
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      "utf8": "Physicists are still exploring these and other questions,"
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