There may be no more vexing challenge in the Revenue Code than the taxation of foreign transactions of multinational companies.

FORBES: A New Way To Address The International Tax Mess For U.S. Companies

The Supreme Court case dealt with whether federal law allowed landlords who rent to minorities a right to challenge a city housing code.

CNN: Holder criticizes longtime foe Issa at committee hearing

Participants in the challenge must submit all of their code to the Synapse platform.

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And Muslim women who observe a strict dress code are seen as a challenge to European notions of secularism and modernity.

NPR: In Europe, Muslim Women Face Multiple Issues

Code For America faces an opposite challenge: convincing techies with opportunities to make gobs of money in Silicon Valley to take comparatively low-paying government roles.

WSJ: Beyond the Three R's: Push to Teach Coding at School

He explains that the challenge is in figuring out whether or not the JavaScript code ever stops running.

FORBES: Google Isn't Just Reading Your Links, It's Now Running Your Code

Few will disagree that monocultures, thanks to the wide deployment of a single code base, rife with vulnerabilities, is the single biggest cause of the cybersecurity challenge.

FORBES: New Cybersecurity Focus For Federal R&D Group