The UCSB group used more conventional electrical circuits, albeit ones that must be cooled almost to absolute zero to make them superconducting and activate their quantum behavior.

Over the last decade, Dr. Henshilwood’s teams have shaken conventional wisdom by finding persuasive evidence that people living in the cave were taking important strides toward modern behavior.

The study, based on a survey of more than 20, 000 kids, challenges conventional wisdom that says teens engage in risky behavior because they think they're invulnerable to harm.