[Signalman]

I am a physicist by training after watching the zapruder film there is no way you can convince me the head shot did not come from the grassy knoll

You're a physicist? Are you familiar with the "jet effect" and Newton's 3rd law: "To every action there is always an equal and opposite reaction"

The bullet that hit Kennedy's head came from the rear, i.e. Oswald's rifle. Brain matter forced out the front of Kennedy's head which propelled his head and shoulders backwards.

[Mr. K]

yes, I am familiar with that, and I discount it as a stupid theory that sounds plausible enough to convince the gullible

[Mr. K]

"The bullet that hit Kennedy's head came from the rear, i.e. Oswald's rifle. Brain matter forced out the front of Kennedy's head which propelled his head and shoulders backwards"

Jackie Kennedy crawled onto the trunk to retrieve his brains and carried them into the hospital