Sir Richard Branson is on the hunt for the Usain Bolt of Jamaica's entrepreneurs

The air is full of pale yellow butterflies when Debbie Turner, founder of Turner Innovations, pulls up outside the Branson Centre of Entrepreneurship in her pickup. It’s the end of August in Kingston, Jamaica. This phenomenon will take place for just two weeks, as the cloudless sulphur butterfly emerges from its cocoon in the lignum vitae, Jamaica’s national tree. It’s 30 degrees in the shade – there will be no sign of Hurricane Irma for another fortnight – and Turner rushes into the...