Riddle: There are four brothers, one of them can run but never weary, one of them can eat but never be full, one of them can drink but never be thirsty, one of them can sing any type of song.
Who were these brothers?
Answer: Run but never weary - Water, river
Eat but never full - Fire, burn
Drink but never be thirsty - Earth, soil
Sing any type of song - Wind, whismical