What They Know

Marketers are spying on Internet users -- observing and remembering people's clicks, and building and selling detailed dossiers of their activities and interests. The Wall Street Journal's What They Know series documents the new, cutting-edge uses of this Internet-tracking technology. The Journal analyzed the tracking files installed on people's computers by the 50 most popular U.S. websites, plus WSJ.com. The Journal also built an "exposure index" -- to determine the degree to which each site exposes visitors to monitoring -- by studying the tracking technologies they install and the privacy policies that guide their use.

via blogs.wsj.com
(Click here to see an interactive tool)

Hypergiant: VY Canis Majoris

VY Canis Majoris is a red hypergiant star located in the constellation Canis Major. At between 1800 and 2100 solar radii (approx 2.7 billion km), it is currently the largest known star in terms of relative size to our own sun (although not in terms of mass).

The size is beyond comprehension.

If you Canis replaced our own star, it would engulf everything up until Saturn.

It's width, as compared here, is just short of all the planets to Uranus.

It's BIG!

via www.flickr.com