Time travel? Mind manipulation by the CIA.
The Monroe Institute used sound to help subjects achieve meditative states in the Gateway Process.
"..., the Gateway Experience uses sound to manipulate brainwaves with the goal of creating an altered state of consciousness in which a person can interact with nonphysical aspects of reality.
Practical uses of the technique, according to the CIA report, include manifesting goals, converting energy to heal one's body, and even traveling across space and time to access new information."Source: Open Culture newsletter May 29, 2024
The link leads to a rather short article, which is why I gave you the option of looking at the YouTube video. If you have 15 min. to kill.
