She first grew interested in the subject after working as a high-school math teacher.

NEWYORKER: Don��t!

Whitney and Lawrence, both self-professed math nuts, became friends after their children did in 2008.

FORBES: Names You Need to Know: MoMath

Enrolled Penn students who complete the online option can take a departmental exam to prove their knowledge and pass into higher-level math classes, just as they can after finishing an AP class.

WSJ: Big MOOC Coursera Moves Closer to Academic Acceptance

You guys deserve a lot of congratulations. (Applause.) We appreciate you. (Applause.) Progress has also been possible thanks to math and science coaches, and extra learning time in after-school, and Saturday school, and summer school.

WHITEHOUSE: President Obama and Jeb Bush on Education in Miami

Perhaps you're a math tutor who can spare two hours a week at an after-school center.

WSJ: Helping Your Cause��and Your Career

The Khan Academy was founded in 2008 by a MIT-grad hedge fund analyst Salman Khan after he began recording web tutorials on math and science for his younger cousins and uploading them to YouTube.

FORBES: Forget Comp Sci 101: Learn To Code With A Click Of Your Mouse

Cut after-school funding only after consolidating the 105 federal programs meant to encourage kids to take math and science classes.

WSJ: Review & Outlook: The Sequester Revelation

The last member of the group, a slight, nervous-seeming man with a grey goatee had retired this past summer after 40 years of teaching math in a Fort Worth high school.

CNN: Why a pundit wrote a novel