One of the advantages of having a world-beating science journal in the Macmillan stable is that one can invite extraordinarily interesting people to come and talk to our staff. We've had a series of fascinating presentations by scientists, politicians, authors. Today sees a talk by Cory Ondrejka who is CTO of Linden Lab, the developers of Second Life. The concept is both fascinating and scary. An article is this week's Observer newspaper describes things better than I could but I do recommend you take a look at Second Life if only out of fear for the future of cyberhumanity.