Ok, when I worked at Starlab on the Sr. Management team in Brussels we had a physicist on staff working on time travel. I had to explain this to cynical VC's. For any of you who have pitched an idea to a sceptical VC you can imagine the sell was tough. Here is a video which highlights some work being done on building a time machine. If the device works, it may be able to retrieve information from the future. Have a cup of coffee then watch this, think about it. Go for a walk, then watch it again. To paraphrase the great Danish physicist Niels Bohr, "If you think you understand the implications of this, you haven't probably understood it at all."