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In this setup, light is not forced through specific routes; instead, it moves naturally through the device, guided by basic thermodynamic behavior.

"These large engravings are not just rock art - they were probably statements of presence, access, and cultural identity," said lead author, Dr. Maria Guagnin from Max Planck Institute of Geoanthropology.

The study analyzed tissue from 59 individuals who had depression and 41 who did not.

Had the unsigned fighter not answered his phone when the call came that Tuesday evening in February, he believes he would still be stuck in his day job.

If not for the resulting suspension, it would have been a mere footnote in an otherwise excellent performance.