Create a focused speaker so your music targets only the listener. That demodulates at 40 kilohertz, with an H-bridge and ...

For more than a century, scientists have known that waves can behave in ways that seem to defy common sense, from freak walls ...

Researchers in Drexel University’s College of Engineering have developed a thin film device, fabricated by spray coating, that can block electromagnetic radiation with the flip of a switch. The ...

Quantum physics overturned classical ideas by showing that matter behaves very differently at the ...