The site provides answers and explanations to problems in over 285 textbooks used in American classrooms.

FORBES: An Apple for the iPad? Technology & Education Start-Ups

My education had trained me to have a lust for answers and explanations.

NPR: Utterly Humbled by Mystery

Interestingly, other students supply all answers and explanations.

FORBES: An Apple for the iPad? Technology & Education Start-Ups