The block chain or general ledger could be a secure repository of private information, property ownership, and conditional contracts. For example, consider buying a car. The dealership sells it to you and it goes into the block chain. You have a private code that identifies you as the owner.

Rape is one of the oldest weapons of war and it remains so to this day. For too long, it has been viewed as an 'unfortunate' side effect of war. But really, it is a tactic. The truth is that stable societies are built on the backs of women.

The change I'm most passionate about – because of the impact it's had on my own life – is creating a healthy transition to sleep that begins before you even step into your bedroom. I treat my own transition to sleep as a sacrosanct ritual. First, I turn off all my electronic devices and gently escort them out of my bedroom.

My early experience as an unaccompanied child refugee on the Kindertransport brought me to England in 1939, evading Nazi Europe. That really had an enormous impact on me, everything was different. It was such a big change, that change doesn't throw me anymore. I've learned to enjoy change, I like to do new things, make new things happen. I'm also very conscious that my life was saved, and I decided, very early on, to make mine a life worth saving.

Humans began to create and believe things that exist only in their own imagination. Things such as gods, nations, money and human rights. This enabled humans to start cooperating on an unprecedented scale.