More than two dozen people bundled up to camp out before the U.S. Supreme Court for a seat to watch oral arguments in a same-sex marriage case on Tuesday. Elise Hu/NPR hide caption

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Noah Zandan shows off his Zeo sleep-tracking headband. His other self-tracking devices are on his wrists. Noah and his father, Peter, are both part of the growing "Quantified Self" movement. Elise Hu/NPR hide caption

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Elise Hu/NPR

Self-Tracking Apps To Help You 'Quantify' Yourself

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In a 1988 debate against George H.W. Bush, Michael Dukakis's answer to a question about whether he would support the death penalty if his wife were raped and murdered is considered a huge stumble. LENNOX MCLENDON/ASSOCIATED PRESS hide caption

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Facebook CEO Mark Zuckerberg emphasized his company's mobile-centered future Tuesday, in his first public comments since Facebook's troubled IPO. Eric Risberg/AP hide caption

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Eric Risberg/AP

Cover art for The Jefferson Lies Thomas Nelson Publishers hide caption

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Thomas Nelson Publishers