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It's possible to subsist almost entirely on items found in Walmart (you can even buy tents if you don't have a home), but there's one product found in a quarter of all American households that most Walmarts don't stock: guns. Until now. Walmart is returning the gun counter to a big chunk of its stores.

BPA , an estrogen-mimicking chemical found in food and drink can linings, adhesives, and many plastics, has been repeatedly linked to breast cancer, early puberty, infertility, and other health problems. The stuff is really bad for you.

Your electric car might get you into heaven, but it's not going to save the Earth if China keeps up at its current pace. But while China may remain the world's largest energy consumer and CO2 emitter--that's just what happens when you represent 20% of humanity--the country can still put a dent in its energy and carbon consumption, stabilizing its emissions before mid-century

Gone are the days when having a website for your business was optional. In fact, many businesses these days can't afford even a few minutes of downtime where their customers can't access their site

A controversial (read: insane) alternative multiple sclerosis treatment has gained a popular following in Canada via social media, wrongly influencing research priorities.

Most people looking for skincare advice would probably head to a local department store and find one of those white-coated counter workers, or pick up a basketfull of products at Sephora.

The Fast Company reader's essential source for breaking news and innovation from around the web--updated all day. Verizon Can Hear You...24 Hours Later Verizon's 4G LTE data network has just come back online after a 24-hour blackout

Move over massages, martinis, and manicures. RapidBuyr wants to sell you printers, pens, and PowerPoint. (Yes, we adore alliteration!) The daily deals moshpit has mostly been a consumer affair so far

New add-ons come to the do-stuff-while-chatting app launched by a young Israeli entrepreneur. Innobell , an app from an Israeli tech wunderkind who had to pitch an Army general to score time to work on it , launches four new add-ons today

The underground laboratory at Gran Sasso in Italy is the home of the Xenon100 experiment, which is being conducted as an international collaboration that includes the Heidelberg-based Max Planck Institute for Nuclear Physics to detect the mysterious particles directly.

My entrepreneurial journey has seen me start and exit four companies, one of which, my research business, was acquired by a public company.

Following the recent disaster in Japan, the Tokyo Hackerspace --an open community space where hackers get together to play with hardware (among other things)--channeled its hive mind not into its usual playing with lasers and forgetting to shower, but rather into helping the country recover from earthquake and nuclear-related woes. The Tokyo Hackerspace's most high-profile project is its NETRAD geiger shield, an open-source geiger counter shield that detects local radiation levels. Eventually, the hackerspace hopes to expand its sensor network to the Fukushima region

1. Hot rumors are circulating this morning that Apple has bought the domain name iCloud.com from network cloud storage firm Xcerion in Sweden. Inside sources say Xcerion sold the name to Apple for about $4.5 million--and it's rebranded its system to CloudMe.

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This article is part 6 of an 8 part series. Learn more about core versus context in part 5