Those suffering Anorexia Nervosa are obsessed with weight, checking sometimes 30 times a day, and keeping a close reign on their weight. A pound gain in weight can be perceived as terrible.

In order to build a truly powerful brand, you can't just sell a product. You need a brand that is authentic and resonates deeply with your fans. The reason we've been able to amass so many followers around the world in such a short period of time is that they aren't just consuming a product; they're finding meaning in it.

Space triggers that innate curiosity in us about what's out there, where we came from, and the possibilities those answers could bring. Humans are explorers – our imaginations can run wild- it's in our DNA. Our fascination with space links to our ability to dream, to wonder, to be curious and to have big ideas.

This has been a heart-wrenching day, and I will never forget the destruction and suffering that I have witnessed. I have visited the scenes of many natural disasters around the world, but nothing like this. The scale is so large: so many people, in so many places, in so much need.

There's also a danger in acting of identifying yourself as an actor. We have to try to identify ourselves as human beings first, and our jobs second. I'm Sam, I act sometimes… not I am Sam, I am an actor.

If you had to make everything up in your life, from the start, with no input whatsoever – that wouldn't be freedom – you'd be less free; you'd have to think constantly about what you should or should not do. There would be no structure for your life choices.

I think those pictures we took did jumpstart the modern environmental movement, but it wasn't a personal change for me at that point.

I remember being on a spacewalk and had a few seconds to see a view that humans were not meant to see. It was like I was hearing from God. But then, I had to get back to work.

There are all kinds of things where we can use technology to reflect our own humanity to better us.

Digital media has allowed a complete bypass of those structures – there's less control around power – and people can amass huge followings for totally irrational reasons. Social media has broken the stranglehold that hierarchy often has in organisations for better and for worse.

It has become appallingly obvious that our technology has exceeded our humanity.

Taking breaks can help us re-engage with the things we've grown accustomed to. Many people experience this when they go away for a business trip and return home, suddenly appreciating their family, home, and even the view from their window more than before.