# Time May Fold Back on Itself. Or Something **URL:** \ **Category:** Miscellaneous and Personal Stuff I Must Share\ **Created:** [July 5, 2007, 2:03am UTC](https://boards.straightdope.com/t/time-may-fold-back-on-itself-or-something/410549 "2007-07-05T02:03:12Z")\ **Posts on this page:** 14\ **Page:** 1
**Author:** ![Tuckerfan](https://avatars.discourse-cdn.com/v4/letter/t/eada6e/32.png) [@Tuckerfan](https://boards.straightdope.com/u/Tuckerfan)\ **Post date:** [July 5, 2007, 2:03am UTC](https://boards.straightdope.com/t/time-may-fold-back-on-itself-or-something/410549/1 "2007-07-05T02:03:12Z")
[Mind bendingly serious article on an experiment to see if time travelling particles are possible.](http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2007/01/21/ING5LNJSBF1.DTL) > [@](#): > > If you can do that, Cramer says, why not push it to be better-than-instantaneous, and try to make the signal arrive before it was sent? His extra twist is to run the photons you choose how to measure through several kilometers of coiled-up fiber-optic cable, thereby delaying them by microseconds. This delay means that the other beam will arrive at its detector before you make your choice. However, since the rules of quantum mechanics are indifferent to the timing of measurements, the state of the other beam should correspond to how you choose to measure the delayed beam. The effect of your choice can be seen, in principle, before you have even made it. That’s the _easy_ part. ---
**Author:** ![ivylass](https://avatars.discourse-cdn.com/v4/letter/i/9de053/32.png) [@ivylass](https://boards.straightdope.com/u/ivylass)\ **Post date:** [July 5, 2007, 2:04am UTC](https://boards.straightdope.com/t/time-may-fold-back-on-itself-or-something/410549/2 "2007-07-05T02:04:13Z")
My head hurts. Ouch. ---
**Author:** ![Least\_Original\_User\_Name\_Ever](https://avatars.discourse-cdn.com/v4/letter/l/e480ec/32.png) [@Least\_Original\_User\_Name\_Ever](https://boards.straightdope.com/u/Least_Original_User_Name_Ever)\ **Post date:** [July 5, 2007, 2:07am UTC](https://boards.straightdope.com/t/time-may-fold-back-on-itself-or-something/410549/3 "2007-07-05T02:07:35Z")
[QUOTE=ivylass] My head hurts. Ouch. [/QUOTE] Ah, but it already did hurt. You’re just remembering what it hurt like in the future. ---
**Author:** ![ivylass](https://avatars.discourse-cdn.com/v4/letter/i/9de053/32.png) [@ivylass](https://boards.straightdope.com/u/ivylass)\ **Post date:** [July 5, 2007, 2:09am UTC](https://boards.straightdope.com/t/time-may-fold-back-on-itself-or-something/410549/4 "2007-07-05T02:09:46Z")
Keep talking geeky. It turns me on. 😛 ---
**Author:** ![Least\_Original\_User\_Name\_Ever](https://avatars.discourse-cdn.com/v4/letter/l/e480ec/32.png) [@Least\_Original\_User\_Name\_Ever](https://boards.straightdope.com/u/Least_Original_User_Name_Ever)\ **Post date:** [July 5, 2007, 2:11am UTC](https://boards.straightdope.com/t/time-may-fold-back-on-itself-or-something/410549/5 "2007-07-05T02:11:22Z")
_now feeling the pressure_ How about a nice…back rub? We can converse about something geeky then! ---
**Author:** ![Autolycus](https://avatars.discourse-cdn.com/v4/letter/a/22d042/32.png) [@Autolycus](https://boards.straightdope.com/u/Autolycus)\ **Post date:** [July 5, 2007, 2:18am UTC](https://boards.straightdope.com/t/time-may-fold-back-on-itself-or-something/410549/6 "2007-07-05T02:18:33Z")
“Strange as it sounds, retrocausality is perfectly permissible within the known laws of nature” Time running backward is part of nature? ::head asplodes:: ---
**Author:** ![ivylass](https://avatars.discourse-cdn.com/v4/letter/i/9de053/32.png) [@ivylass](https://boards.straightdope.com/u/ivylass)\ **Post date:** [July 5, 2007, 2:20am UTC](https://boards.straightdope.com/t/time-may-fold-back-on-itself-or-something/410549/7 "2007-07-05T02:20:17Z")
I was watching the Science Channel and they were talking about Hawkin’s Paradox and black holes and I thought my brain was going to melt. ---
**Author:** ![Tuckerfan](https://avatars.discourse-cdn.com/v4/letter/t/eada6e/32.png) [@Tuckerfan](https://boards.straightdope.com/u/Tuckerfan)\ **Post date:** [July 5, 2007, 2:29am UTC](https://boards.straightdope.com/t/time-may-fold-back-on-itself-or-something/410549/8 "2007-07-05T02:29:30Z")
[QUOTE=Autolycus] “Strange as it sounds, retrocausality is perfectly permissible within the known laws of nature” Time running backward is part of nature? ::head asplodes:: [/QUOTE] :::Gives **Tuckerfan** an idea::: Hey! Let’s build a time machine, go back in time and show the article to Einstein! 😃 ---
**Author:** ![Sunspace](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/sunspace/32/1250_2.png) [@Sunspace](https://boards.straightdope.com/u/Sunspace)\ **Post date:** [July 5, 2007, 3:00am UTC](https://boards.straightdope.com/t/time-may-fold-back-on-itself-or-something/410549/9 "2007-07-05T03:00:16Z")
Me, I’d like to go back and tell myself to ask Anna-Marie Hubbard out, dammit. Greatest regret of my life. ---
**Author:** ![ivylass](https://avatars.discourse-cdn.com/v4/letter/i/9de053/32.png) [@ivylass](https://boards.straightdope.com/u/ivylass)\ **Post date:** [July 5, 2007, 3:05am UTC](https://boards.straightdope.com/t/time-may-fold-back-on-itself-or-something/410549/10 "2007-07-05T03:05:03Z")
Yes, but see, under this theory, you already did ask her out. ---
**Author:** ![Least\_Original\_User\_Name\_Ever](https://avatars.discourse-cdn.com/v4/letter/l/e480ec/32.png) [@Least\_Original\_User\_Name\_Ever](https://boards.straightdope.com/u/Least_Original_User_Name_Ever)\ **Post date:** [July 5, 2007, 3:05am UTC](https://boards.straightdope.com/t/time-may-fold-back-on-itself-or-something/410549/11 "2007-07-05T03:05:46Z")
You already did everything you were ever going to do with her as well… …so…was it any good, tiger? ---
**Author:** ![Cartooniverse](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/cartooniverse/32/3084_2.png) [@Cartooniverse](https://boards.straightdope.com/u/Cartooniverse)\ **Post date:** [July 5, 2007, 3:18am UTC](https://boards.straightdope.com/t/time-may-fold-back-on-itself-or-something/410549/12 "2007-07-05T03:18:39Z")
[QUOTE=Tuckerfan] :::Gives **Tuckerfan** an idea::: Hey! Let’s build a time machine, go back in time and show the article to Einstein! 😃 [/QUOTE] Didn’t you mean you wanted to go back in time and show the Particle to Einstein ? ---
**Author:** ![Rysdad](https://avatars.discourse-cdn.com/v4/letter/r/7cd45c/32.png) [@Rysdad](https://boards.straightdope.com/u/Rysdad)\ **Post date:** [July 5, 2007, 5:17am UTC](https://boards.straightdope.com/t/time-may-fold-back-on-itself-or-something/410549/13 "2007-07-05T05:17:40Z")
Back in time, schmack in time. I just want to be able to hop ahead 24 hours, buy a paper, and then come back to where I was. And buy a lottery ticket. ---
**Author:** ![DMark](https://avatars.discourse-cdn.com/v4/letter/d/e68b1a/32.png) [@DMark](https://boards.straightdope.com/u/DMark)\ **Post date:** [July 5, 2007, 6:00am UTC](https://boards.straightdope.com/t/time-may-fold-back-on-itself-or-something/410549/14 "2007-07-05T06:00:20Z")
[QUOTE=Rysdad] Back in time, schmack in time. I just want to be able to hop ahead 24 hours, buy a paper, and then come back to where I was. And buy a lottery ticket. [/QUOTE] My luck, that would be the one edition where they had a misprint.