Three-dimensional dancing on soundwaves

Researchers find new ways to defy gravity with sound

Nearing the midpoint of the second decade of the 21st century, we finally have video phones. But where are the floating skateboards and flying cars? Perhaps what researchers are describing as “acoustic levitation ballet” points to some eventual possibilities.

Rebecca Black, Friday

We need a Black Friday for enterprise technology

If you work in enterprise technology, you’re probably in the middle of a furious “race to the finish” of sales right about now. Here’s a modest proposal to fix the Q4 crunch.


New Uber delivery option: First condoms, then cats … and now $135 Christmas trees

OK, so first it was condoms. Then it was same-day cat delivery service. And now, on-demand car service Uber is offering Christmas tree deliveries.You better have a pretty flush wallet, though.Uber announced on its blog today that it is initiating Christmas tree delivery service in 10 cities in partnership with Home Depot, including New York, San Francisco, and Los Angeles. I just spent $40 on a 7-foot Noble Fir, but Uber will charge $135 for the same tree.Ouch!There is a bit more too it, of course. Not only do you get the tree — and the door-to-door delivery — you also get a tree stand and an unspecified “Uber gift.” That’s probably a discount or voucher for Uber service. And there’s no need for cash, Uber will take payment via PayPal, Google Wallet, or credit card (score one for digital wallets!).To get your ho-ho-ho via Uber, download the app and request the tree between 11AM and 8PM on Thursday this week. Other cities that are participating are Atlanta, Boston, Chicago, Dallas, Philadelphia, San Diego, and Washington DC.But you’d better do it early.Uber says availability will be “very limited.”


Apparently it's free marketing week (or, can we please all stop droning on about drones?)

So Amazon is experimenting with drones that will deliver its goods via “Prime Air” — its “octocopter” robotic aircraft that will deliver packages up to 10 miles from Amazon’s warehouses. And UPS, unwilling to be left completely out of the consumer orgy hype cycle, says it has been testing and evaluating delivery drones as well. TechCrunch thinks drones should be used to rent stuff instead of buying it, and CNN is investigating how they would work.