'Closed timelike curve' is the jargon for time travel. It means you go out, come back and meet yourself in the past. -Kip Thorne Travel
A black hole really is an object with very rich structure, just like Earth has a rich structure of mountains, valleys, oceans, and so forth. Its warped space whirls around the central singularity like air in a tornado. -Kip Thorne Space
