Since this is getting to be Night Shift, I'll share a funky dream from two nights ago involving time travel.
It was discovered to be possible only going backward in time, not forward. "Living" organic matter could not be sent, nor could solid inorganic matter. In the dream, it was quail eggs that were sent, and both white hats and black hats were trying like crazy to figure out how to put messages in/on them that would be authentic to whomever found them in the past. They could control where and when the eggs arrived, but that is all.
Crazy.