With this spinning top, you will never have to answer (or even ask) the question that popped as Chris Nolan’s “Inception” ended: did the top drop or did it continue spinning? In the 2010 blockbuster, ...

Remember how, in Christopher Nolan’s Inception, Leonardo DiCaprio’s character Dom Cobb uses a spinning top to work out whether he’s awake or dreaming? If the top spins a few times and then topples ...