There are more than 4000 landing trace cases from around the world.

Back in the early 1960s, when I was eight or nine. Some neighborhood boys and I saw a disc-shaped, windowless object that hovered, silent, then simply vanished. My parents said, "That's very nice" and ignored it, but I knew what I'd seen, and it was life-changing.

It is an understatement to say that the time has arrived for a serious and open international dialogue regarding the possibility of future interplanetary relations. In no other area of human experience has so much evidence existed for so long, and yet been attended by such a paucity of serious research and analysis - at least in the civilian domain. While the subject matter of UFOs itself is extraordinary, it is the absence of a serious human response to it that is most extraordinary.

There are more than 3500 military and commercial aircraft pilot reports of encounters worldwide; many cases have corroborating radar documentation and multiple witnesses both on the ground and in the air.

It's been by turns frustrating and fascinating and wonderful beyond imagination. If what I suspect is true, it's one of the most important milestones in human history to acknowledge that we are not alone in the universe.

Various polls have indicated that approximately 10% of Americans (25 million people) have seen them at close range so that details of the structure of the object can be discerned.

There are hundreds of electromagnetic cases where spacecraft have been observed by police, military personnel and civilians to affect car engines, radios and other electric devices.