Shaping the rings of molecules

Macrocycles are molecules made of large rings of atoms. Despite being relatively big and flexible, the molecules don't always stay "floppy"—they can actually lock themselves into specific shapes and geometries.

Investors to get Google records on online drug ads

(AP) -- A Delaware judge has given Google Inc. until April 9 to give a pension fund investors company documents involving what authorities said was the illegal online marketing of prescription drugs to U.S. consumers by ...

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