"The "energy receiver" (gravitational energy converter) had been built by Tesla himself."
http://waterpoweredcar.com/teslascar.html
"Researchers have found the first direct evidence of a “background” of gravitational waves in the universe — a sign that gravitational waves from slowly merging pairs of supermassive black holes, or possibly from the early universe, can be detected from Earth in a background field of low-frequency energy."
https://news.yale.edu/2023/06/28/astrophysicists-present-first-evidence-gravitational-wave-background
"Scientists have new evidence that the fabric of space and time is rippling with gravitational waves as big as the Milky Way. The waves could be created by some of the biggest black holes in the universe. Black holes are thought to send out these elusive waves when they merge. Until now, researchers have only been able to detect gravitational waves from much smaller black holes. These newly detected waves could be a signal from the dawn of the universe itself."
https://www.npr.org/2023/06/29/1185080706/astronomers-have-some-big-gravitational-wave-news
"Gravitational waves are created by any object that spins, such as the rotating remnants of stellar corpses, orbiting black holes or even two people “doing a do-si-do,” Dr. Mingarelli said. But unlike other types of waves, these ripples stretch and squeeze the very fabric of space-time, warping the distances between any celestial objects they pass by.
“It sounds very sci-fi,” Dr. Mingarelli said. “But it’s for real.”"
https://www.nytimes.com/2023/06/28/science/astronomy-gravitational-waves-nanograv.html
Scientists discover that universe is awash in gravitational waves
https://www.reuters.com/science/scientists-discover-that-universe-is-awash-gravitational-waves-2023-06-29/