By David Hambling
Posted 08.01.2012 at 3:28 pm 13 Comments
In the 1930s, U.S. Navy researchers stumbled upon the concept of radar when they noticed that a plane flying past a radio tower reflected radio waves. Scientists have now applied that same principle to make the first device that tracks existing Wi-Fi signals to spy on people through walls.
By Stewart Wolpin
Posted 02.23.2012 at 12:20 pm 7 Comments
In late 2010, Verizon rolled out its 4G LTE network, which offers data speeds 10 times as fast as 3G networks. But as mobile data traffic continues to grow—experts anticipate that it will increase 26-fold in the next three years—it’s unlikely that any network will be able to keep up. Fortunately, something else is set to happen over the next three years: Wi-Fi could become as ubiquitous and easy to access as cellular is now.
By Sean Kane
Posted 11.07.2011 at 11:07 am 5 Comments
A new tool called Euclid Analytics is the physical version of Google Analytics, recording and analyzing physical traffic instead of website visitors. The startup's cofounder, Scott Crosby, helped to build the technology of its internet counterpart. But instead of reading IP addresses, Euclid observes physical visitors by listening to smartphone Wi-Fi signals.
The system uses a sensor box, installed in a closet, that picks up signals from the phones.
It's safe to say that most of us have come to accept, if not embrace, the abundance of wireless technology in our everyday lives. Not so for certain Americans who believe they suffer from Electromagnetic Hypersensitivity, or EHS. According to the BBC, five percent of Americans think that exposure to electromagnetic fields created by Wi-Fi and mobile phones are causing them to suffer headaches, muscle spasms, burning skin and chronic pain. And some of these people are seeking refuge in the secluded mountains of Appalachia.
Discovered during a dig through the FCC's experimental radio applications by Steven J. Crowley, it has come to light that North American Eagle is trying to install what will presumably be the fastest-moving Wi-Fi network on the ground--because it's being built inside a vehicle designed to break the world land speed record (and the sound barrier) at 800 miles per hour.
By Darren Murph
Posted 08.11.2011 at 11:01 am 4 Comments
The most affordable way to stay connected is to rely on Wi-Fi to make calls and get online. If you’re stuck in a hotel, plug a $99 AirPort Express into the wall to turn an Ethernet connection into your own personal Wi-Fi network so you can use your smartphone and other devices.
Why are we reviewing an SD card? Usually, SD cards are just there--these days, high-capacity cards are dirt-cheap and nearly disposable. They're essential, but in the same way shoelaces are essential--you replace them when you need to, but you don't give them a lot of thought. Eye-Fi's new Direct Mode for its X2 line of SD cards, though, is different.
The need for more consistent cell reception has led to some major, expensive efforts from wireless carriers--they might spend hundreds of millions of dollars on a new 4G network, or billions to acquire a competing carrier.
Smartphone makers, wireless carriers, and credit card companies have all proclaimed their love for near field communication over the last week. And we share their enthusiasm: NFC has a lot of exciting potential. Soon enough, we'll be able to make payments, unlock our houses, stop worrying about our cumbersome Wi-Fi passwords, and hop on the subway without a transit pass, all from our phones. Here's how.
Radio communications devices can either send or receive wireless signals at a given moment, but they can’t do both at the same time (hence the regular use of the word “over” to signal the end of a transmission). But a team of electrical engineering grad students and professors at Stanford has done what researchers have long thought impossible by developing a new antenna setup that allows wireless signals to be sent and received at the same time.
Last year, we wrote about a particularly bright scheme for using a room’s lighting to also transmit data, creating a wireless Internet connection that relies on visual light rather than radio spectrum. It seems the city of St. Cloud, Minn., thinks there’s something to the notion too.
Studies on the impact of wireless radiation on humans are endlesslyinconclusive, but a recent study on the effects of Wi-Fi radiation on trees--yes, trees--indicates that our woody friends may be much more vulnerable than we are.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.