hard-science is a good tag when used properly, providing very high quality answers. I notice though that it is typically used with respect to physics and other hard sciences. Physics definitely is my favorite branch of science, but world building could benefit from social sciences as well. As an...

[Jon Skeet] is famous on Stack Overflow. Who is our Jon Skeet and associated facts. Propose one user per answer, and their awesome feats! Also, humor should generally be related to world building, and this site's culture, of course.