This is the 21st century. Girls often have a hard time with math and science and they need AFFIRMATION, not crap like this demeaning their intelligence or drive. REMOVE this merchandise and replace it with clothing items that say things that lift up girls' desire to do well in school.
Also check out the incredible National Center for Lesbian Rights (which is all-LGBTQ and NOT a lesbian-only legal advocacy organization) at http://www.nclrights.org/. Their lead council, Shannon Minter, will be the first-line presenter before the California Supreme Court in our attempt to revoke Proposition 8.