Never was wealth the driver for me. – it was always hey, there's a cool idea here, let's make something of it. It was nice to be well rewarded, but the interesting part was working the problem, thinking about new things and how to bring them forward from being ideas to being products or new ways of doing things.

All the great achievements of humankind – from building the pyramids to reaching the Moon – are based on large scale cooperation. And all large scale human cooperation is based on belief in fictions such as gods, nations, money and human rights.

Ancient philosophy almost hasn't been bettered as a kind of therapeutic toolbox in 2400 years, and have a certain aesthetic to them which makes you feel part of a long tradition.

Social media platforms are the tobacco companies of the 21st century, and they need to be regulated – especially when it comes to children. These platforms are selling a highly addictive product and continue to allow abuse and hatred on their platforms. Over 33% of all UK 18–24-year-olds have experienced abuse on Facebook.

Space also taught me that when you think you're at 100% of your physical or mental capacity, you're not. We have enormous reserves within us (which we don't tap into for good reason), but we are all capable of pushing ourselves a lot further than we think.

To scale? you have the stars aligned- timing is everything. When we created the first personal digital assistant, the Newton... we were probably 15 years too early. Even some of the best computer scientists in the world didn't realise that at the time, we needed Moore's Law to continue doubling processing power every couple of years for at least a decade before it was practical to build products like iPhones.

The important thing which central government can do is to promise, without reservation, that there will be no new taxation and 'emergency' taxation- and that they will focus on collecting existing taxes by expanding the tax-base to those who are evading taxes.

I think that inequality within societies and between regions has become a key cause for conflict, exacerbated by rapid information dissemination, as people are now more aware of inequalities.

If your strategy is to do everything, you have no strategy at all.

My favourite question when evaluating a startup idea is, 'Is this from the future?' I'm not interested in your ideas about the future; I want to understand why you are living in it today. Why are you living in a different future right now than other people are?

Even if there's no profound cultural difference between brown, black and white Britons… they speak the same language, eat the same food, abstain from going to the same churches… identity culture assigns significance to their bodily differences, and so race exists.

Status hierarchies help us navigate choices which would otherwise be impossibly complex. It dramatically reduces the cognitive load we face in making decisions.