SUMMER MATH CHALLENGEGrid numbersSusana Rueda Monserrat / Álvaro de la Rúa|Jul 31, 2014 - 19:48 CESTEL PAÍS and the Royal Spanish Mathematical Society present their first summer math challenge
15:44Allred out, Crockett in: The battle for Texas Senate seat is upended by a surprise withdrawal and candidacy
13:14Belle da Costa, the woman who concealed her origins in 1905 and ended up running New York’s most legendary library