WASHINGTON - The FBI says Washington Navy Yard gunman Aaron Alexis left a note saying he was driven to kill by months of bombardment with extremely low-frequency radio waves.
Valerie Parlave, assistant director in charge of the FBI's Washington field office, said Wednesday that Alexis did not target particular... more »
Two NASA spacecraft captured the clearest sound recordings yet from Earth's radiation belts and they're described by a scientist as the chirping of "alien birds". The Van Allen Probes are studying the radiation belts and collecting detailed measurements of high-energy particles and radio waves. These so-called chorus waves operate in... more »