An anonymous reader writes "Mozilla quietly posted the first beta build of its Firefox 4 browser early this morning. The 'Chromified' browser leaves a solid first impression with a few minor hiccups, but no surprises. If you have been using a previous version of Firefox 3.7, which now officially becomes Firefox 4.0, you should already feel comfortable with this new version. Mozilla has not posted detailed release notes yet, but there seem to be no major changes from Firefox 3.7a6-pre, with the exception that the browser is running more smoothly and with fewer crashes." Update: 06/29 18:40 GMT by S : Mozilla's Asa Dotzler writes, "Mozilla has not shipped Firefox 4 beta yet. We are in the process of making and testing the final set of changes, but we're not quite there yet." Changed headline to reflect this.

fergus07 writes "Researchers have detected oral cancer cells using a fiber-optic cable and an off-the-shelf Olympus E-330 camera worth $400. The work by Rice University biomedical engineers and researchers from the University of Texas M.D. Anderson Cancer Center could improve access to diagnostic imaging tools in many parts of the world where these expensive resources are scarce. In the tests, a common fluorescent dye was used to make cell nuclei glow brightly and images were taken using the tip of the fiber-optic bundle attached to the camera. The distorted nuclei, which indicate cancerous and pre-cancerous cells, could then be distinguished on the camera's LCD monitor."

shmG writes "Google Inc. has announced a 'new approach' in China after the government said the company could no longer automatically redirect users to the unfiltered Hong Kong site. This gives Baidu Inc., which already has a greater than 60% share in Internet search in China, a chance to expand. It has announced new plans to hire US engineers to enhance its technical skills and propel its growth globally." Update: 06/29 18:27 GMT by S : Changed the headline to more accurately reflect what Google is doing. They're ending the redirect and applying for a license renewal, so it's still in question whether they'll actually go dark in China. However, they say they're also looking for ways to continue allowing uncensored search, such as putting a high-profile link to their Hong Kong site on the google.cn landing page.

A few anonymous readers noted that Seagate has released a 3TB external drive. This makes it the largest 3.5-inch in its class, and it is available with USB 2, 3, or FireWire. That's more capacity than my entire four-drive RAID for just $250.

jqpublic13 writes "The City of Detroit, Michigan, is suing Comcast's local subsidiary citing a 2006 agreement which the City says violates the constitutions of both the United States and the state of Michigan. They claim that a federal act from 1984 supersedes the local agreement. Comcast has 20 days to respond."

crimeandpunishment writes "A lot of Facebook users going through divorces have learned a very costly lesson about their privacy settings. In fact, for many of them their Facebook pages helped lead to the divorce in the first place. More than 80% of the members of the American Academy of Matrimonial Lawyers say they've used or run into evidence gathered from Facebook and other social networking sites over the last five years — and some of them have some very entertaining stories to tell. 'Facebook is the unrivaled leader for turning virtual reality into real-life divorce drama,' said AAML's president."

An anonymous reader sends in a mathematical puzzle introduced at the recent Gathering 4 Gardner, a convention of mathematicians, magicians, and puzzle enthusiasts held biannually in Atlanta. The Tuesday Birthday Problem is simply stated, but tends to mislead both intuitive and mathematically informed guesses. "I have two children, one of whom is a boy born on a Tuesday. What's the probability that my other child is a boy?" The submitter adds, "Believe it or not, the Tuesday thing is relevant. Well, sort of. It's ambiguous."

sciencehabit sends this snip from Science Magazine, with included video: "Researchers have created flat sheets of composite material that can fold themselves into toy boats, tents, and even paper airplanes. Based on the ancient art of origami, the sheets are edged by foil actuators — thin, solid-state motors — that contract or expand when they receive an electric current from flexible electronic circuits embedded in the sheets. After they achieve their preprogrammed shape, the sheets are held in place by tiny magnets on the edges of the fold joints. Researchers say the technology could be scaled up to create ultra-portable tripods or even cups that automatically adjust to the size of liquid being poured into them."

Sue Williams has been awarded a £20,000 grant by the Arts Council of Wales, to "explore cultural attitudes towards female buttocks." Sue plans to examine racial attitudes towards bottoms in Europe and Africa and create plaster casts of women's behinds to try to understand their place in contemporary culture. And here I've been studying the issue all these years for free like a sucker!

The Guardian's games blog convened a panel of engineers and other experts to talk about the current state of video game physics. A great deal of research is currently going on to make better use of multiple cores so that advanced physics tools and engines can take advantage of all the processing power available in modern computers. Many of those tools are being put to work these days to find more realistic ways of breaking things, and game developers are trying to wrap their heads around destructible environments. Mike Enoch, lead coder at Ruffian Games, said, "This idea of simulating interactions and constructing the game world similar to how you would construct the real world generates more emergent gameplay, where the game plays out in a unique way for each player, and the player can come up with solutions to problems that the designer might not have thought of." Another area that still sees a lot of attention is making game characters more human, in terms of moving and looking as realistic as possible, as well as how a game's AI perceives what's happening. "The problem is not necessarily in having the most advanced path-finding technique with large-scale awareness; we need to have more micro behaviors, with a proper physics awareness of the environment," said software engineer George Torres.