Why do you stand looking up toward heaven? That's what the angels said to the baffled disciples who had just experienced the Ascension of Jesus Christ. Peter, James, John, and the others stood there, squinty into the sky, trying to make sense of it all. Tim and Aaron Perry confess to being baffled, too. For centuries, Christians have confessed «He ascended into heaven» in their creeds – but what do these words actually mean? The Perrys offer a probing look at this unfamiliar doctrine,...