In early July this year, I visited Cambridge UK to attend the conference "Darwin 2009". About 4 years ago, I suddenly found the beauty of the sky and the clouds when I took the same train from London to Cambridge. So this trip has become a nostalgic one. In the next few posts, I am going to show some of the scenes and the people I met in Cambridge. Today, I posted the scenery from the first step; the trip from Paris to Cambridge via London.