Answer:
Tear one off and scratch my head what was red is black instead. What is it?
I go up when the rain comes down
Adored by few, feared and hated by many. Mistress of the entire universal reason, master in the art of numbers. Some may have solved many of my mysteries, but there are still many of them to find. What am I?
I go up when the rain comes down. What am I?
I am a rock group with four members all of whom died in plane crashes. Who am I?
No matter how little or how much you use me, you change me every month.