I often emphasise that etiquette is highly contextual, varying significantly depending on the cultural backdrop and the company you're in. These nuances highlight that etiquette isn't about rigid right or wrongs; it's about sensitivity to the context, the people you're with, and the prevailing cultural norms.

The world is so impossibly complex, beautiful and fragile and this gives us so many questions that we should ask. Curiosity is powerful, and that is the heart of TED.

I'd never even heard the word 'entrepreneur' growing up – I didn't know what that meant. If I go back to my grandfather – he was the real entrepreneur. He developed things… he made spiked running shoes when he was only 15 (in 1895!). My grandfather died in 1933, I was born in 1935 and my grandmother insisted I brought his name with me – so I became the next Joe Foster.

I guess the only thing I would say is if you get to the point to where you could comfortably believe that I could die tomorrow and I wouldn't regret my life, I think at least for me, I think that's where success would be.

Nobody ever has control of all of the levers, and nobody ever has complete information. But also, there's always the day after. When dealing with really difficult issues it's very easy to get stuck in the moment and to lose sight of where we do want to be five or ten years from now.