Last week, we begin a series on the hard facts of the UFO mystery. It has been clear for a long time that the US government has information about UFOs and possible aliens that it doesn't share with the public. But what is this, really, and why do they conceal it? Robert Powell is one of the world's leading experts on this subject, and this week, he's going to tell us the definitive story of exactly what is known about government secrets.

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