Sharing is hard. Controlling your volume ; Accessing networks "randomly" ; Pricing data smartly ; A conversation with Dennis Strigl

Ranking is hard. Bidding for ad spaces ; Ordering search results ; A conversation with Eric Schmidt

Crowds are wise. Combining product ratings ; Recommending movies to watch ; Learning socially

Crowds are not so wise. Viralizing video clips ; Influencing people

Divide and conquer. Inventing the internet ; Routing traffic ; A conversation with Robert Kahn

End to end. Controlling congestion ; Navigating a small world ; A conversation with Vinton Cerf.