And so Lee spent the next five months virtually alone, reading Russian novels, writing a math textbook and leaving his cell for only one hour a day.

CNN: ASIANOW - TIME Asia | The Long Way Home

Heather Crossin learned of Common Core in the fall of 2011 when her daughter brought home a math book linked to the standards that she found to be weaker than the previous textbook.

WSJ: New School Standards Spur a Backlash