We are held back by our deep, underlying fears. Fears of rejection, fears of being the imposter. We need to reframe these fears and work on regret minimisation. If you didn't take that action, spark up that conversation, or try that idea, would you regret it? if you would- then don't hesitate, do it.

Quantum mechanics says our world is nebulous, fuzzy, a haze of possibilities until it somehow snaps to attention upon an appropriate interaction, observation or measurement. That's a very strange reality, and the fact that this theory is so demonstrably correct is radically important to our understanding.

Everybody has regrets- the only people who don't are babies, sociopaths, and people with brain damage. You might wonder why an emotion that's objectively so unpleasant is also so ubiquitous? Well… it's because it's useful (if we treat it right).

Why does torture happen? There are a variety of reasons, paramount is the role of torture as a 'shortcut' to investigating crime- many investigators and police have used this from time immemorial, and the efforts to abolish and curb it have been progressing over the years.

Entrepreneurial businesses innovate, change, evolve and meet customer needs… it's about creating things that people value and love.

We can't only rely on consumers making individual choices. If you switched your energy to someone who told you they are selling you 100% renewable energy, that's great, but it doesn't shift the energy system to renewables. You need to have energy markets that are designed to encourage investment into renewable energy.

We have to be aware of our cognitive fallacies to build some immunity to our cognitive traps. One simple thing we can all do is work on our own confirmation bias from time to time. I try to read things by people I disagree with for example, because I want to hear their best arguments and see whether my beliefs and values stand-up to them.

27 years ago, when I started in UFC, I knew it was going to be one of the biggest things in sports- honestly. It was always a spectacle, but needed refining to become a mainstream, extreme sport. All the excitement we used to get from watching those movies we can now watch in reality. The men and women who come into the octagon are also really fascinating, have incredible stories, incredible personalities- UFC really captures you… it captures hearts and minds.

The field of positive psychology, and people in general, would benefit from thinking harder about what a good life is. A lot of people think we're pleasure motivated hedonists, but it turns out we have many other goals. We want happiness, but that comes in many different forms. We want pleasure, we want to be good people, we want to make a difference in the world, we want meaningful pursuits.

I approached fighting, and each contest, as an experiment. I would develop hypotheses on what strategies and techniques were winning, I would set-up experiments (or go into fights)- try them out- run tests- look at the results and try to be as unemotional as possible.

I didn't like the rampant tracking and the fact that Google and Facebook effectively ran some of the largest information gathering networks on earth (and that's a very charitable way of describing it).

I was at one of our schools in Kenya recently, I was just chatting away to a group of children about all the things we had seen that day- the lions and how lucky they are to be sitting next to Meru National Park, and I said 'would anyone like to ask me a question?'. Suddenly this little boy put up his hand and he said 'please miss, why do men kill lions?'. Well, I could have hugged him if he wouldn't have been mortified with embarrassment.