I remember reading several accounts of time cameras, starting all the way back in the early 1900s. They claimed using a quartz crystal lens made it so they could view events in the past. Somebody discovered it again in the 50s supposedly, and it was once again confiscated by the authorities.

It made me wonder if all electromagnetic waves, even light, has a half-life, and much like our ability to view radiation signatures long after a radioactive object moves, if you had the right kind of lens it would be able to view the half-life of light waves.

That kind of technology would be a dealbreaker for the powers that be. Things like Kennedy's assassination would be solved by simply going to the location of the assassination and viewing the area with a time camera.

Back in the early 2000s I tried to get a quartz crystal lens for my canon camera, but the only place I could find that sold them required you to submit a reason for the request. I never did get around to digging into that subject to find out if that was just a fluke.