An ambulance carrying Amber Vinson, the second health care worker to be diagnosed with Ebola in Texas, arrives at Emory University Hospital in Atlanta on Wednesday. David Tulis/AP hide caption

itoggle caption David Tulis/AP

Insulin is produced by the green cells that are in clusters about the same size as the islets in the human pancreas. The red cells are producing another metabolic hormone, glucagon, that prevents low blood sugar. Harvard University hide caption

itoggle caption Harvard University

People wait to sign up for unemployment Sept. 3 at the Atlantic City Convention Center in Atlantic City, N.J., where thousands of workers at the closing Revel and Showboat casinos recently were laid off. Mel Evans/AP hide caption

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Eimear McBride won the 2014 Baileys Women's Prize for Fiction for her debut novel, A Girl Is a Half-formed Thing. The novel was rejected by publishers for almost a decade. Stuart C. Wilson/Getty Images for Baileys/Diageo hide caption

itoggle caption Stuart C. Wilson/Getty Images for Baileys/Diageo

University police, FBI agents and Cambridge, Mass., officers all responded on Monday when Harvard received messages claiming that bombs had been planted in four buildings. None were found and a student has been charged in the hoax. he allegedly wanted to avoid taking a test. Josh Reynolds/AP hide caption

itoggle caption Josh Reynolds/AP

SWAT team officers on the scene Monday at Harvard University in Cambridge, Mass. Four buildings on campus were evacuated after an unconfirmed report that explosives may have been placed inside. Elise Amendola/AP hide caption

itoggle caption Elise Amendola/AP