Sometimes, it already seems like the websites you visit know more about you than you know about yourself — but this is just the beginning. Every day you're helping to generate masses more data, which computers are getting better and better at crunching. How long will it be before the predictive power of these systems…

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A federal judge's decision requiring the government to get a court warrant before obtaining mobile-phone location data is one of a string of conflicting opinions on the topic. It comes as lawmakers and the Supreme Court weigh in on the hot-button issue of locational privacy.

Worried about privacy on the Internet? It may be even worse than you thought - with rapidly improving face recognition technology, your automatically tagged Facebook pictures could help a stranger, or the authorities, quickly identify you on the street.

Generating truly random numbers is notoriously difficult. But now, using a quantum system, researchers have managed to create 42 genuinely random numbers. Their discovery is a major breakthrough for cryptography, and could one day enable truly private communication online.

Are we drawing closer to a day when everything that's a "thing"—from spoons to shirts to skateboards—comes with an electronic sensor that hooks it into a global network of trillions of objects? Maybe. Is that a good thing?

Need another reason to be paranoid about companies and governments watching what you're doing online? A technology researcher has created a web tool that shows just how easy it is to identify you based on nothing more than a click.

This isn't concept art for Dr. Manhattan or CG work for a nude android — it's the body of a random man, walking through an airport scanner. You won't meet the person viewing this ultra-revealing image, but still.

These glowing images look like a kind of luminescent jellyfish at the bottom of the ocean, but they're actually the trails left by an LED attached to a RFID tag. These tags create invisible patterns as they move through cities.