* Another week, another discovery about the NSA going through everyone's e-mails.
* Rio police prepare to 'pacify' another favela.
* Not even other conservatives are happy with the power grab in North Carolina.
* The social now: "how upvote/downvote sites like Reddit breed irrational herd behavior."
* Scientists believe they've identified the asteroid that spawned the Chelyabinsk meteor.
* Evidence of early humans on the Thames in 7000 BC.