Some riddles about love include: "What makes grown men cry, but humanity would go extinct without it?" and "What causes a sudden increase in heart rate, a loss of memory and overall brain function, but is not a drug?" The answer to both is "love".
Many riddles are based off of love and romance. A number of these explicitly end with the word "love," while others require more advanced word play.
While the answer to a riddle can simply be called an answer, the term "solution" is also applicable. Either term is usually acceptable, although the type of riddle helps delineate which word is best for the riddle in question.
Riddles are essentially word puzzles that use metaphors to describe something very specific. Riddles can also be jokes that are plays on words. These usually take the form of question and answer, for example, "Why was the picture sent to jail?" The answer is that it was...
What gets wetter and wetter the more it dries?" is an example of a tricky riddle that plays on contradiction. The answer is "a towel."
Short riddles are short word problems that are designed to be slightly challenging to answer. Short riddles can be found on the Internet or in riddle books, and they often have a rating scale indicating how challenging they are.
One well-known riddle in Western literature is that of the sphinx: "What moves forward on four legs in the morning, two legs at noon and three legs at night?" The answer is man, who crawls in infancy, walks as an adult and uses a cane in old age.