I define authenticity as the consistent practice of choosing to know who we are and embracing who we are. For a lot of us, we come to know who we are, but then we rail against our identities.

I still believe that nuclear is the greatest risk we face as a society today.

Most people think of entrepreneurs as someone who starts a company, but to me? Entrepreneurship is really about problem solving. People can (roughly) be divided into three categories. The first category are people who can tell you all the problems in the world! The second group of people are those who invent, innovate and find solutions to these problems. The third group, entrepreneurs, are those people who don't talk about the problem or solution but go out and solve it.

This is a really exciting time for human space exploration, we have a lot to be hopeful about – and we have a whole bunch of private companies who have very credible strategies and vehicles. Like in so many other industries, the government has played a key role in kickstarting things – but to realise the full potential of this industry (space) we'll need private industry to get involved seriously; and we're just at the beginning of that journey.

It's about catching that surge of emotion, be it offense or anger, usually incited by someone attempting to ignite your social identity or signal an outgroup threat, with a likely aim to shape your thoughts or actions.

If you don't give people legal routes to hope, they will find illegal routes and put themselves in the hands of criminals. That's the reality. We have record numbers of refugees and displaced people, and so for criminal gangs this is a business which is at scale.

Rationality applies whether you believe in it or not. One idea follows from another – or it doesn't – and if you want some of your beliefs to lead to other beliefs, you have no choice but to be rational. We're committed to it by the very act of discussing, arguing, debating, persuading and convincing.

I looked at her and said, 'that's impossible! If I had stolen these pears from you… you would never have seen me!'

Investors who previously thought that sovereigns were a quasi-risk-free asset have been challenged in that respect. Domestic local-currency sovereign debt is certainly not risk-free. It very much depends on the willingness and ability of the sovereign to pay-back its debt!

Emotions are the brain's way of making us pay attention immediately to what is most important so that we can react as quickly as possible. In evolution, that meant 'survival' – the rustle in the bushes may be our next meal or may make us its next meal – something that we have to chase, or run away from – and in either case, we don't want to have to stop and think.

Our mission is to expand the economic sphere of influence of humanity off the surface of the planet and into the solar system. Currently we have a vibrant economy in space that goes out to the geostationary belt- where the communication satellites are- and it stops.

Instead of worrying about powerful artificial intelligences in the future, we should be concerned about the lack of intelligence in the Oval Office today!