The Pyramid of the Sun, at Teotihuacan, Mexico, is being searched for possible
hidden chambers, using a muon tracking technique inspired in the experiment
carried out by Luis Alvarez over 30 years ago at the Chephren Pyramid, in Giza.
A fortunate similarity between this monument and the Pyramid of the Sun is a
tunnel, running 8 m below the base and ending close to the symmetry axis,
whic
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