When economist Roger Babson was a boy, his oldest sister drowned. His grandson would later die in a similar manner. As an adult, Babson would use the considerable wealth he made predicting the 1929 ...

Antigravity -- Beyond rocket propulsion -- Onward and upward -- An etheric explanation -- The U.S. antigravity squadron -- Gravity beam propulsion -- Project skyvault -- Microwave phase conjugation -- ...

Well, I know other hardware is a stretch for this, but it is the coolest scientific paper I have read in my lifetime, an the ramifications are astounding. So if you thing it doesn't belong here, ...

The TR-3B Black Manta is linked to decades of black triangle sightings and claims of an advanced propulsion system using pressurized mercury, nuclear energy, and plasma to reduce mass and signature.

National Air and Space Museum Technical Reference Files: Aircraft, NASM.XXXX.1183.B, National Air and Space Museum, Smithsonian Institution. National Air and Space Museum Technical Reference Files: ...