Measuring the Greenland shark’s growth rate is challenging because individuals are rarely recaptured. However, one shark tagged in 1936 had only grown 2.3 inches when it reappeared 16 years later.

Cerrie Burnell, author of 'The Girl with the Shark's teeth', divulges her favourite shark facts. Watch the video and then vote for your favourite below! BBC Homepage ...

Innovation and creativity come alive when the savvy investors of Shark Tank gather to hear pitches from aspiring entrepreneurs across the nation.