I found this on Ars Technica. “At a meeting of the Acoustical Society of America in Seattle earlier this month, Anderson described how he figured out how to focus sound-wave energy precisely enough to knock over a single Lego minifig without disturbing other minifigs clustered around it.”
Basically physicist Brian Anderson used a “frickin Laser” and a sonic blaster to selectively target individual Lego minifigs. I expect to see this in next seasons Lego Masters.