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After 2000 years, the symbols of the Teotihuacan pyramids deciphered
The imposing pyramids of Teotihuacan, in Mexico, bear the traces of a major civilization over two thousand years old. One ...
How do astronauts track sleep? A new study introduces a smartphone-based melatonin test that monitors circadian rhythms in just 15 minutes using fluorescent nanoparticles.
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