"If they’re so frigging advanced why are they crashing? Because what’s crashing is not actual living things. I use this example a lot — if you wanted to study a tribe of cannibals in the middle of the Amazon, are you going to go yourself and show up in the middle of the tribe and not hopefully become dinner? If you’re an advanced intelligence, you’re not going to put your life and limb at risk by coming here.”
Dr Nolan said “mostly what you’re seeing here are either drones or some sort of advanced AI or whatever it is”.
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Good thing they've discredited those ridiculous claims of reverse engineering downed UFOs.

Only the shadow knows...and those are obvious.