Riddle: They can trickle down, They can tickle too. Or make you sneeze, Or comfort you. Their rustling sound, you've rarely heard, Unless you're a pillow or a bird! What are they?
There are four brothers in this world that were all born together. The first runs and never wearies. The second eats and is never full. The third drinks and is always thirsty. The fourth sings a song that is never good.