Ready?
Right here, out in the middle of the desert, miles from any city, are huge concrete tubes, that are part of a giant machine running the most precise experiment humans have ever built.
This experiment is happening inside two tubes, each 4 km long.
And inside each tube, there's a big metal pipe.
And at the end of each pipe, scientists place some of the smoothest mirrors ever made.
And then they fire a powerful laser that gets split down each tube, bouncing back and forth and back and forth, building up power until they bring those beams back together to detect something that just a hundred years ago scientists said was impossible to find.
Finding it took hundreds of scientists and over a billion dollars.
But what exactly did we find?
And what's the cutting edge we're finding now... that makes those same scientists want to build an even bigger one?
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