slides from week of 25 July

https://docs.google.com/leaf?id=0B09lW9XhoFydNWZiZTg0MmYtMThmMC00Y2I4LWJjNDItYjA5Y2Y2NzdmMWFh&hl=en_US

https://docs.google.com/leaf?id=0B09lW9XhoFydZWZkYzFmYTItOWZkMS00MDM5LTk0MmUtNjA4YjFiN2Q4ZGE0&hl=en_US

https://docs.google.com/leaf?id=0B09lW9XhoFydOWM4NjIxZDAtNWNiZS00YjA4LWE3ZDEtYjU5OGVkNGUwMTI5&hl=en_US