Researchers at MIT's Lincoln Laboratory, a United States Department of Defense research facility, developed laser systems that can "transmit various tones, music and recorded speech at a conversational volume" to specific people without the recipient wearing any special equipment. Basically, the operator points a laser at someone from a distance and that individual hears the transmitted audio even though others in the area don't. Conspiracy theorists, start your engines. From the Optical Society of America:
"Our system can be used from some distance away to beam information directly to someone's ear," said research team leader Charles M. Wynn. "It is the first system that uses lasers that are fully safe for the eyes and skin to localize an audible signal to a particular person in any setting..."
The new approaches are based on the photoacoustic effect, which occurs when a material forms sound waves after absorbing light. In this case, the researchers used water vapor in the air to absorb light and create sound...
One unique aspect of this laser sweeping technique is that the signal can only be heard at a certain distance from the transmitter. This means that a message could be sent to an individual, rather than everyone who crosses the beam of light. It also opens the possibility of targeting a message to multiple individuals.
"New technology uses lasers to transmit audible messages to specific people" (Phys.org via The Daily Grail)
"Photoacoustic communications: delivering audible signals via absorption of light by atmospheric H2O" (Optics Letter)
I’m not an engineer, but I can’t stop watching this hypnotic and oddly satisfying video of tying rebar.
The Australian Acoustic Observatory project, described by its creators as a kind of “Google Street View of sound,” is a new acoustic sensor network of hundreds of microphones and digital audio recorders distributed across multiple remote ecosystems on the continent. The solar-powered system will record animal and natural sounds continuously for 5 years. According to […]
Is your brain a machine? Are your thoughts and feelings just malware of the mind? (And what “really” is a machine, anyway?) John and Eva referee the transhumanist fight of the century. In the blue corner, we have Eva meeting founder and Bryan Johnson, CEO of Kernel, straight from his office in LA. And in […]
Cheap massage chairs are a common Christmas gift, but we’re willing to bet they don’t get a lot of actual use from the people who could really use a massage. We’re talking about people with deep, chronic joint pain or anyone who does a serious workout on a regular basis. For that kind of soreness, […]
The bummers of adulthood are too many to count, but one of our least favorites is the inability to sit down and enjoy a nice bowl of cereal. When you’ve got a long commute ahead, let’s face it: That extra time it takes to pour the milk and chow down is too precious to spare. […]
Who are these people that have time for a job, social life, and actual healthy meals? With a nutrition segment on seemingly every talk show and entire networks devoted to food, it can sometimes seem like we’ve never left our mother’s house and her constant admonitions to “eat your vegetables!” And okay, she was right. […]