[Gallery] Shortlist for the best ghost photos of the Edinburgh International Science Festival

According to foreign media reports, the Edinburgh International Science Festival has recently opened. These "ghost" photos were taken by amateur photographers and have made the shortlist for the "Best Ghostly Mystery" photography competition held at the Edinburgh International Science Festival. Are they really ghosts? Some people explained that this is actually the result of overexposure, but some people firmly believe in the existence of ghosts. Can you persuade them?