Engineers at Ohio State University have developed a radar system that's both more accurate than traditional radar and completely undetectable, allowing one to see objects through solid material such as walls and floors. By using random noise rather than a specific frequency, the system makes its signal undetectable to all but the originating machine, which looks for very small differences in a return signal. Conventional electronics like radios and TVs would filter out those differences since they tune to specific frequencies. Unfortunately for leadfoots, the technology could also be used by cops to gauge speed without setting off radar detectors. It further improves upon standard radar by being accurate at both very close and very far ranges, being able to detect something a few feet away just as well as it could tell you what's on the surface of Mars. The accuracy can distinguish people from inanimate objects by sensing very slight movements, something that could help search and rescue teams find people trapped under rubble. Perhaps the most impressive aspect of the new system is the price: the equipment needed would cost less than $100, making it an easy purchase for smaller police departments and rescue squads. Ohio State plans to patent the system and then research more potential uses for it. — Adam Frucci