Greetings to my friends in China! It has been too long! I last visited China in 2006 when I took part in a physics conference in Beijing. It was an extraordinary experience. My first trip was in 1985 when I travelled across your remarkable country by train. In my physical travels, I have only been able to touch the surface of your fascinating history and culture. But now I can communicate with you through social media – and I hope to tell you more about my life and work through this page and also to learn from you in reply.