With all the work to do, people to see, traffic jams to get stuck in, we all sometimes wish we could be in two places at once. We’ve already cloned sheep, cows, chickens, even monkeys. What if we ...

Erasing a memory like throwing away an old receipt? Forgetting a difficult breakup like deleting an old voicemail? It's an idea that makes you dream, or even shudder. This "science fiction fantasy" is ...