Is time-travel possible? Like as the concepts described in movie- 'back to the future'! In world war 2, i feel that it was impossible to built nuclear weapons of high impact magnitude covering a wide area. In 1940s there were not even ICBMs, nor any capable planes to payload and attack at precision. So i think in 1965s US, china etc might had decided to sent a nuke thru time travel in 1940s carried by an F-15. Like also shown in movie 'terminator'. Even in 911, the planes might had appeared from nowhere in the sky. What do you say?