even katy perry had a 50% decline with 2 huge global monsters and at her prak
the only one who didn't decline was beyst but it was due to smerican support. in the rest of the world she also suffered a drastic decline from 4lop and she has never flopped as hard as with pretty flops (and she has MANY flops)
E=MC2 is pretty basic knowledge not necessarily correlating to a grade level. In fact, one should know what it means and what subject it belongs to just from history.
