What classic puzzle involves trying to get a farmer, a goat, a wolf, and a cabbage across a river using a small boat that can only carry the farmer and one other item, without leaving the goat alone with the cabbage or the wolf alone with the goat?
Which complex logic puzzle, reputedly devised by Albert Einstein in his youth, involves deducing the owners of five houses, their nationalities, drinks, cigarettes, and pets, based on a series of fifteen clues?