Africa is a vibrant, varied continent with a growing consumer base.

The moral case for gender equality is obvious. It should not need any explanation.

Many businesses understand the advantages of gender parity.

We need new, dynamic models for growth through the sharing economy, using big data to unlock new insights and adopting closed-loop cycles.

While Fidel Castro used to deliver his marathon seven-hour speeches in Havana, Cubans used to joke that if Spanish lacked a future tense, their leader would be speechless. He was only fluent in broken promises, they lamented.

If you are a leader, you should never forget that everyone needs encouragement. And everyone who receives it - young or old, successful or less-than-successful, unknown or famous - is changed by it.

It was easy for Sanford to have a bully pulpit as governor. It's another thing to be in the trenches, having to face leadership, and say, 'No, that's not a conservative position, that's not what we're doing.'

But I think Steve's main contribution besides just the pure leadership is his passion for excellence. He's a perfectionist. Good enough isn't good enough. And also his creative spirit. You know he really, really wants to do something great.