In other news, the House Intelligence Committee has expanded their Russian interference investigation to include Cambridge Analytica, the Trump campaign's data and voter targeting firm.
Meanwhile, the FBI has charged a man for trying (and failing) to bomb an airport in Asheville, North Carolina. The criminal complaint says the man, Michael Christopher Estes, was "getting ready to fight a war on U.S. soil."
Finally, the Associated Press has obtained a recording of the mysterious signal that US embassy personnel in Cuba have been assaulted with. You can listen to it at their website. It should be safe to listen to. I listened to it.
To me it sounds like a Long Range Acoustic Device (LRAD) used for crowd control, but it's actually quite complicated according to the Press.
A closer examination of one recording reveals it’s not just a single sound. Roughly 20 or more different frequencies, or pitches, are embedded in it, the AP discovered using a spectrum analyzer, which measures a signal’s frequency and amplitude.
To the ear, the multiple frequencies can sound a bit like dissonant keys on a piano being struck all at once. Plotted on a graph, the Havana sound forms a series of “peaks” that jump up from a baseline, like spikes or fingers on a hand.
“What it is telling us is the sound is located between about 7,000 kHz and 8,000 kHz. There are about 20 peaks, and they seem to be equally spaced. All these peaks correspond to a different frequency,” said Kausik Sarkar, an acoustics expert and engineering professor at The George Washington University who reviewed the recording with the AP.