Doing something which has a social purpose gives you the motivation to overcome the hurdles and obstacles that you will meet along the way. It gives you that inner strength when you're doing something and you know it's making a massive difference.

I do not talk about life and death – I talk about birth and death, they are opposites, and life is simply a continuum of both, and you cannot have one without the other.

There are cultures in which a young man, to signal his interest in a woman, would camp outside her house for any number of days. The ones who aren't really interested say, '...to hell with it, it's not worth it!' – In this sense, signalling screens people out.

We need to get out of the peacetime footing that we are on and we need to get onto a wartime footing against this climate crisis. During World War II, the US allocated 50% of GDP roughly to fighting, and I believe we need to get to 50% of GDP sustained over 5 to 10 years.

Children are bought and sold like animals, sometimes at a lower price than animals. 168 million children work as child labourers, more than 200 million children who should be in education are not at school.

We can become resilient however, and learn to have peace of mind, even when we experience traumatic events. We can learn to have stable peace of mind... happiness? Maybe not. It's unhelpful to say to someone, 'do these 10 things to be happy' – there are things you can do to get peace of mind, increase your probability of happiness, and your probability of having successful relationships.

To be completely happy is the same as to be fulfilled, to flourish, or to thrive – to enjoy complete well-being, to have our complete and final good. We seek happiness for its own sake, not to get something else. This is our goal and deepest longing.

We advocate for a 'feminist moonshot' approach, symbolized by the dandelion. Its seeds, spread by children, represent the spreading of our positive narrative towards a cleaner, healthier, more equitable world on the brink of a clean energy revolution.

Look at someone like Leonardo da Vinci, he was interested in so many different areas, and connected the dots to create his amazing work. Look at Steve Jobs. He took calligraphy at university, and applied it to create the user interface for the Mac! The more we understand, the more we can ask questions.

In the future, these blood tests will allow us to offer treatments for Alzheimer's disease 10, 20, or even 30 years before symptoms start to manifest, much like how we currently handle cholesterol. This early detection and intervention will be our strategy for combating Alzheimer's.

I think you'll see strong growth in the markets in developing economies like Brazil, India, China, Mexico, Malaysia, Singapore and places like that. In that sense, it will be a larger market- a growing pie- risk in that sense will be distributed more.

This is nothing to do with the 0.000001% who go on to be professional fighters – it's about the 99.9% of people who train because they enjoy it, and connect with it – and who apply the lessons they've learned to deal with the setbacks, failures, victories, challenges and tests they're going to get in work and life.