Can We Trust Stephen Hawking?

We all know Stephen Hawking, the famous scientist and popular media figure. When Hawking talks the people listen, and they believe. But can we trust what he says? Here's what Dr. Mendel Sachs writes: "Hawking says that general relativity theory predicts that one could warp spacetime to effect this outcome [ie time travel]. But he is mistaken on his interpretation of the meaning of time in relativity theory."