I guess for some of you won’t know who Sheldon Brown is but for many his web site contained an encyclopaedic wealth of knowledge for all things pedal power related.
It is with a deep sense of sadness that I read today that he has passed away. Not only was he a source of knowledge but his web site gave an insight to his life and he was an early adopter of a blog style way before the blog phrase came into use. I hope his web site is preserved; I worry that much of our knowledge and memories exist in an electronic form that is both easily accessible but also transient and easily lost.
If you want to find out more have a look at the Wikipedia page and follow the links from there.