Fact can be stranger than fiction. This is especially true of black holes, as Prof Stephen Hawking explains.For instance as soon as you entered the black hole, reality would split in two. "In one, you would be instantly incinerated, and in the other you would plunge on into the black hole utterly unharmed," as we have previously explored.In the 2016 Reith lectures broadcast on BBC Radio 4, Prof Hawking further examines and challenges the latest scientific thinking about black holes.