The pieces of DNA you find in the Y-chromosome don't go through the same shuffling process that other DNA undergoes, so it is easier to trace,

We are going through a process of mass cultural extinction.

If you go far enough back, your genome connects you with bacteria, butterflies, and barracuda - the great chain of being linked together through DNA.

It turns out that every person alive today can trace his or her ancestry back to Africa. Everyone's DNA tells a story of a journey from an African homeland to wherever you live.

We spent an enormous amount of time as hominids and as primates living as hunter-gatherers. That is the natural way for us to live, and we're suddenly living in this profoundly unnatural way, and we're still in the process of adapting to it and working out how to live with it.

The key is to have a kind of core DNA - a series of pieces that are part of the look of the restaurant, that change and morph based on conditions in each case.