See through walls using wireless signals

Perhaps you hide your thoughts with an aluminum cap, but you can not hide from wireless networks that can reveal your location, even behind a wall.

Researchers at the University of Utah say that the way ranging signals from a wireless network can reveal the movement of a person behind closed doors. Joey Wilson and Neal Patwari have developed a technique called CT images based on the variance radio waves "that processes the signals to show signs of movement. Even the idea has been tested on a wireless network of 34 nodes using the IEEE 802.15.4 wireless standard, the standard for wireless personal area networks with low rates of data transmission, such as ZigBee.

The basic idea is simple. The signal strength at any point in a network is the sum of all paths of radio waves can take to reach the receiver. Any change in the volume of space through which signals pass, for example, caused by the movement of a person, causes the signal strength varies.

Patwari Wilson and say they were able to locate moving objects in the room less than a meter. The team said that there is great potential for improving its system, increasing accuracy and reducing the number of nodes, especially if the system is used with GPS networks, Wi-Fi or cellular networks.

A major benefit is cost, military systems regulated through walls display can cost up to 100 thousand dollars.

This means that the concept of Vision 3D Sonar Batman: The Dark Knight was not entirely unreasonable.

Amazon will pay $ 150,000 US dollars for deleting a homework

Remember that Amazon had the bad idea to remotely wipe the books "1984" and "Animal Farm" a lot of Kindles in the United States without permission from the people who had bought (ironically to George Orwell).

Well, a boy named Justin Gawronski had to do homework on "1984" and had his notes listed on the Kindle, along with the book. One day he woke up and bam! Amazon had eaten their work. So Justin could not think of anything better to sue the company.

Before the court could settle the matter, Amazon agreed with lawyers for Justin through which paid USD $ 150,000, and pledged that he will not delete e-books to its customers.

In any case the agreement indicates that some of these USD $ 150,000 will go to charity. The deal must be approved by a U.S. court, but good news for Kindle users (and the kid who pocketed a lot of dollars through their work lost).