As many in the northern hemisphere head to the beach, we dispel the 'Jaws' myths and find out why sharks are vital to the ocean and the planet. And Dutch musician Don Diablo drops a summer hit that will help re-forest parts of Africa. With:  Andy Cornish, Global Shark & Ray Conservation Programme Leader at WWF Don Diablo, musician  Wessel van Eeden, Marketing and Communications Director at Justdiggit