It-was a tiny mollusc that caused Walter, grandfather of the greatest biologist of the twentieth century, to forge a brief link with the greatest biologist of the nineteenth: Charles Darwin. . . . . . We know this because later that day he wrote hesitantly to Darwin to report what he had found.

I opted for a freelance writing career. I was lucky enough to have the means to do it.

I felt cheated by the way grown-ups told me that the future of the world was bleak when I became a teenager in the 1970s. The pollution explosion was unstoppable. Global famine was inevitable. I genuinely want the next generation, my own kids, to know that actually it's possible that the future might be better than the past.

As a small boy Francis Crick had been haunted by a fear that by the time he grew up everything would have been discovered. Inspired by Arthur Mee

Prosperity has brought complications. Our lives are busier, faster, more stressful. They're nostalgic for a simpler, slower time.

It's terrifying the way molecular biology has become more and more jargon ridden. But I strongly believe that my book can be read by the intelligent layman. I want everyone who bought a copy of 'A Brief History of Time' to buy a copy of 'Genome'.