Skip to navigationSkip to content
HEAR HERE

Scientists are using sound vibrations to knock over Lego people

Michael Tabb
By Michael Tabb

Video journalist

This article is more than 2 years old.

Any science teacher knows the power of a demonstration to bridge the gap between theory and physical experience. But not all science is easy to see, which is why researchers at Brigham Young University devised a novel way to show off a technique they study: time reversal.

Once called “matched signal processing,” the more evocatively-named time reversal is a technique to concentrate sound waves at a particular location. It’s used to direct vibrations in medical ultrasounds, and researchers think it could be the future of private communications.

Check out the video above to watch time reversal selectively knock over Lego figurines, and get a sense of how the decades-old but little-understood technique works.

📬 Kick off each morning with coffee and the Daily Brief (BYO coffee).

By providing your email, you agree to the Quartz Privacy Policy.