Better yet, it's available free on-line: http://spectrum.ieee.org/telecom/wireless/a-new-twist-on-radio-waves /eric, kj7ae -- View this message in context: http://elecraft.365791.n2.nabble.com/OT-Distinguishable-angular-momentum-in-radio-photons-tp7525974p7528611.html Sent from the Elecraft mailing list archive at Nabble.com.