Some of the topics in this show are interesting and present shocking altenative theories into things we'd come to accept as a given.
In one episode it's said that John Wilks Booth did not die at the barn but lived many years after. That it was covered up to appease the people. Another says that the details of Billy The Kid's death are false that he too survived long after.
The UFO episode while mostly redoing old stuff did bring up ideas rarely said. That ETs coming to Earth are millions or a BILLION years ahead of us. That's mind blowing to consider. I can't even imagine what Humans will be like in that amount of time. Even the minimum of one million would mean changes that can barely be imagined. Sure there would be better tech and we'd have used sublight craft to reach other stars, but what about evolution. Then move things ahead a billion years and the "people" of that time probably don't look anything like us. Either way there'd likely be local differences. Mars born Humans would be taller and thinner etc.