Time twister. A Connecticut theoretical physicist with a lifelong passion for reading everything he could get his hands on about time travel thinks that “closed time-like loops” to take us back in time are achievable. A circulating beam of laser light can twist time into a loop; prohibitive amounts of energy are required unless you slow the light down, which we’ve just figured out how to do. New Scientist Time travel experimenters ought to make a pact that, when they figure out how to implement this scheme, they travel back in time to the present to tell us how to do it (grin).