Most interesting datasets/APIs?

16 points by LearnDataSci ↗ HN
What do you find to be the most interesting datasets/APIs to work with? Which datasets/APIs are you really interested in checking out but haven't yet?

3 comments

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This is more a "spend the rest of the afternoon/evening/early morning getting horribly distracted" list of lists of lists, but I found a lot of it quite interesting, and I definitely have more ideas now than I had before I'd skimmed it:

http://reddit.com/r/datasets/top?t=all