Marc Andreessen started a new VC firm, Andreesen Horowitz, in July but has yet to explain why he deleted his excellent series of articles on entrepreneurship from his site.

I am glad that Jed Christiansen has rescued them from bit rot. Two posts that are definitely worth reading:

• The Pmarca Guide to Startups, part 4: The only thing that matters which talks about “product market fit” and how to achieve it.
• Age and the entrepreneur, part 1: Some data (also read Naval Ravikant‘s response “The Aging Entrepreneur“)