In a new set of oral histories, David Plouffe, President Barack Obama’s political adviser, described how he urged Vice President Joseph R. Biden Jr. not to challenge Hillary Clinton for the nomination.

Oil prices tumbled and yields on government bonds pulled back from highs. But the response faded as the day went on.

As deaths from diabetes start to rival those from infectious threats like malaria, a new form of the condition linked to malnutrition is surfacing in patients who can afford neither screening nor care.