Hey Larry.

>After reading this, it does appear that what we all took to be a typo is in fact the reported results. The pulse exits occurs before it enters.

This reminds me of a short story by Isaac Asimov. I don't remember the title (the book is at home), but it was written as if it was a scientific paper (Asimov was a biochemist, as was I in a former life) on the temporal properties of a new chemical compound. It would dissolve in water a short time *before* the chemist put it in water. How much earlier it dissolved was inversely proportional on how certain the scientist was that he/she would actually add it to the water. If the scientist was only "pretending", the chemical wouldn't dissolve at all. The story was a hoot!

So, I'm guessing something similar would happen here. If the scientist reached for the switch to turn on the light pulse and actually flicked it on, the pulse would appear just before the switch went on. But if at the last second they pulled back, it wouldn't appear. Kind of like going back in time and shooting your grandfather.

Doug