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The [hypothetical] or highly advanced tools that would allow us to manipulate, measure, or travel through the fabric of spacetime, from gravitational wave detectors that feel the universe's vibrations (LIGO, basically the most sensitive microphone ever built) to theoretical warp drives that would let us cheat relativity (requires [negative energy], which we don't have, but wouldn't it be cool?). Spacetime [technologies] are either Nobel Prize-winning achievements or science fiction dreams, with very little in between. The most practical spacetime technology remains the clock, which measures our inexorable march toward the future whether we like it or not.
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