50 years ago president Kennedy was killed and to this day we still don’t know who did it. The official story that Oswald shot him from the 6th floor of the Texas School Book Depository defies the laws of physics. There are a lot of conspiracy theories but we don’t yet have any way to determine if any of them are true. All we really know from the Zapruder film is that Kennedy was shot from the Grassy Knoll. Maybe someday we will know the truth.