Burning Manure Pile

A 2,000 ton mound of cow manure in Nebraska has been burning continuously for three months, to the dismay of the Nebraska Department of Environmental Quality, which says the smoke is in violation of pollution laws. Apparently, the decomposing manure generated so much heat that it spontaneously combusted. And no one knows how to extinguish the fire. They don’t want to quench it with water because the manure will run off into nearby rivers — via BoingBoing

Melting Metal in a Microwave

If you’ve ever had the urge to take up alchemy in the kitchen, as always, there’s a site with detailed instructions available for using your microwave to melt up to 250g of bronze, silver, white metal or iron:

Domestic microwave appliances are based on the magnatron; an electronic device which converts electrical energy to microwave energy, which is fed via a waveguide to the cooking chamber. Since the conversion is somewhat less than perfectly efficient, the magnatron has to be cooled by a stream of air from a fan. This air is then led to the oven to help remove steam produced during cooking. Once in the chamber, the microwaves are reflected by the metal walls until they are absorbed, (usually by water-containing food), their energy being converted to heat. Should absorption not take place — if, for example, the oven is activated when empty, some energy will re-enter the waveguide and cause over-heating of the magnetron. Usually a safety switch turns the machine off when this happens. Note that the reflecting walls and the constant frequency of the microwaves set up standing waves in the chamber. This results in some areas being much more active than others and is the reason why food must be rotated through the varying field to cook evenly.

To be of use for metal casting, a domestic microwave oven rated D or E (850W or 1000W) needs two slight modifications: the rotating glass plate must be removed and the holes which admit air to the cooking chamber must be taped over (masking tape works reasonably well). The air from the magnetron cooling will then be re-directed to the exterior. No other modifications should be made. Microwaves are potentially dangerous and the uninitiated should treat the oven with respect.

It’s worth noting that you shouldn’t be using your microwave for food once you’ve used it to melt metal

Not Quite Dead

Larry Green of Durham, North Carolina was sent to the morgue after he was hit by a car Monday night and declared dead. A few hours later, a medical examiner in the morgue unzipped the body bag and noticed that Green was breathing. He’s now in critical condition. The four paramedics who responded to the accident have been suspended with pay

Judge Demands Web Blackout

Justice Virginia Bell, of the NSW Supreme Court, told a conference in Darwin of Supreme and Federal court judges from across the country yesterday that the ready availability of archived press reports on the internet could jeopardise the trial of an accused person and all information should be purged from the internet. But her call was branded silly and unworkable by the media union, while the internet industry said it would be impossible to police offshore sites

Solving The Enigma Of Kryptos

What does it say about the CIA that its agents can crack the secret codes of enemy nations but can’t unravel a coded sculpture sitting outside their cafeteria window? It says, perhaps, that artist Jim Sanborn, who created the cryptographic sculpture named Kryptos that sits on CIA grounds, could have a career in covert operations if he ever grows tired of stumping the experts — via MemoryBlog

Black Holes Possibly Not Black Or Holes

Everyone knows that falling into a black hole spells doom. Or does it? In the past few years, cracks have started to appear in the conventional picture. Researchers on the quest for a more complete understanding of our universe are finding that black holes are not so black, and perhaps not holes either — via Warren Ellis

FBI Tries To Limit Info Searches

The FBI is fighting in court to limit how hard it has to search for government documents requested by the public under the Freedom of Information Act, one of the main laws for ensuring openness in government. If the bureau prevails, people could have a diminished chance of getting documents from the nation’s most famous law enforcement agency — via MemoryBlog