Katharine the great white shark resurfaces off US east coast

Transmitter attached to dorsal fin of shark with Twitter following had not sent a definitive message for a year and a half

Katharine, a 14ft-plus great white shark with a Twitter following, appeared again off the US east coast this week. A transmitter attached to her dorsal fin had not sent out a definitive message for a year and a half.

The transmitter that was attached off Cape Cod in August 2013 is roughly half the size of an iPhone and is meant to ping whenever the shark breaks the ocean surface.