Online learning and resources topped the Education Dive charts this week, with our STEM resources guide and look at challenges facing MOOCs in 2013 both grabbing interest. Khan Academy's new iPhone-optimized app release also showed up in the mix along with a big acquisition.

Find out how much McGraw-Hill education is selling for and other key facts that should help you get up to speed on the week's news below:

• 14 STEM classroom resources teachers should know about—An indispensable list of lesson creation and classroom activity resources for math and science teachers.
• Khan Academy iPhone app debuts—Khan Academy's mobile app is now available for the iPhone and iPod Touch, with some notable differences compared with other iOS app incarnations.
• 8 questions MOOCs face in 2013—State schools and Ivy League universities signed on to offer big, free classes on the Coursera and edX platforms in 2012. In 2013, they will be forced to evolve.
• Apollo buys McGraw-Hill's education division for $2.5B—The sale will leave McGraw-Hill with its business information firms, and the company will be renamed McGraw Hill Financial.
• UMiami's online high school launches SAT prep MOOC—The University of Miami Global Academy has organized what it calls the world's first MOOC for high school students.

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