The Functional Database - Rich Hickey 

Live coding by Rich Hickey! wow!! Thanks a lot!

You don't need to return the whole db; just a subset of the data as long as it's immutable all the turtles down

Is there a way you can code lisp and closure itself so that each function or module had its entire history in sexpression diffs, and if your program wasn’t working it could go back to a past version. You have to redefine def, and all the different types of vars.

Great talk. Want to know which talk about architecture he was referring to.