sound waves
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Scientists use sound waves to lift and move objects, make cup of joe mid-air
Levitating objects with sound waves isn't anything new, but a team from Switzerland has taken it to the next level by rotating and moving objects as they float. In fact, the researchers were able to manipulate a number of objects mid-air, including water droplets, inserting DNA into cells and mixing up a little instant coffee. If you're wondering how intense sound waves need to be to get things moving (at this level, at least) then 160 decibels is the starting point. If that sounds ear-splittingly loud, that's because it is. But, by using frequencies typically out of the human audible range (24 kHz), no ears were at risk. The movement itself is controlled by a grid of sound-emitting squares. Once the object was in the air, it could be moved around by lowering the volume on one grid point, and increasing it on the next. For now, the science is only able to lift tiny objects, but the same team claims that it'll will soon show similar work using steel balls. Could we use this to get our (sonic) hoverboard? We're not calling that just yet.
Tacit sonar gauntlet gives the blind ultrasonic eyes (video)
Sure, your Arduino project can make a stuffed monkey dance, but is it really doing anything for the greater benefit of mankind? Okay, maybe -- but not to the same degree as Grathio Labs' Tacit glove, an Arduino powered sonar device that can help the vision impaired navigate foreign environments. This wrist-mounted gauntlet is comprised of an Arduino microcontroller, a few ultrasonic sensors, and a pair of servomotors to apply variable pressure to the user's wrist to indicate their distance from an object or obstacle. Best of all, the gizmo's circuit and software are registered under Creative Commons, which means you're free to snag the plans from the source link below, and build your own. Go on, build one. Sure, it's a lot of work, but would you rather rock a wrist-mounted sonar gun, or don an ear-tugging bicycle helmet? Your choice.
The Daily Grind: What game sounds do you like the best?
Sounds may always get the back seat to graphics and animation in MMOs, but in my opinion they're just as -- if not more -- important than what you see. If you'll allow for a bit of cultured snobbery, a game with lackluster sound effects are just so... so... pedestrian. Common gutter trash, even. I'm always keeping an ear out for great sounds in the games I play, such as the meaty thwack of a sword slamming against a mutated iguana or the sonic boom of a misfired mage spell. One of the things I love about RIFT is how the sounds are muted when you're underwater or near death; it's a small touch, to be sure, but it helps to pull me into the world even more. Are you somewhat of an audiophile? Then today tell us what MMO sounds you love the best. Are they spells, attacks, NPC noises, ambient sounds, or something different completely? Every morning, the Massively bloggers probe the minds of their readers with deep, thought-provoking questions about that most serious of topics: massively online gaming. We crave your opinions, so grab your caffeinated beverage of choice and chime in on today's Daily Grind!
