Chemists and materials scientists are trying to learn to build ultra-small, precisely ordered structures for use in optics, electronics, and other applications. Writing in the journal Science, Chad Mirkin and colleagues describe a way to use snippets of DNA to tailor the shape and size of crystal structures, tweaking them to fit specific uses.
NPR's Ari Shapiro speaks with E.J. Dionne of The Washington Post and Brookings Institution and David Brooks of the New York Times about the grand jury's decision not to indict police officer Darren Wilson and the resignation of Defense Secretary Chuck Hagel.
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