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I do cryptic crosswords. On my first attempt, I usually finish about half the clues and get stuck. When I return to the crossword the following day, even if I haven't been consciously thinking about it, I usually get a few more clues very quickly. But after half an hour at most, I become stuck again. What's going on?
In the book, The Hitchhiker's Guide to the Galaxy, the Vogons demolished Earth. They said it would take approximately 2 minutes, so how much energy would they have needed to obliterate our planet? Would kicking the planet out of its orbit have been more energy efficient than simple destruction?