Jillian Blenis, 30, of Boston reacts while stopping at a makeshift memorial to marathon bombing victims Wednesday. Julio Cortez/AP hide caption

Lionfish, like this one spotted in the Bahamas, are a nonnative predatory fish that can decimate native fish populations. Cammy Clark/MCT/Landov hide caption

A DJ plays for a crowded street at Oakland's Art Murmur celebration in February. David Kashevaroff hide caption

Google co-founder Sergey Brin shows off Google Glass in February. Brin says the camera displays an external light when filming, making it difficult for a user to record surreptitiously. Jeff Chiu/AP hide caption

Jackie Robinson during spring training at Vero Beach, Fla., in March 1956. It would be Robinson's 10th and last year with the Brooklyn Dodgers. AP hide caption