A new type of extinguisher that uses sound waves to put out fires has been built by two engineering students in the US. Both chemical- and water-free, the invention offers a relatively non-destructive method of fire control, which could find applications in fighting small fires in the home, and the researchers now hold a preliminary patent application for their device.
While the concept of using sound waves to extinguish flames is not new, previous attempts to realize the principle – including efforts by teams at West Georgia University and the US Defense Advanced Research Projects Agency (DARPA) – had not been successful.
Undeterred by this, as well as initial [...]
Joel Aschbrenner reported on the front page of the Business Section in Friday’s Des Moines Register that, “Iowa farmland prices fell 8.9 percent in the past year, the largest annual decline in 28 years, according to a report released Thursday by the Center for Agricultural and Rural Development at Iowa State University.
“But the average price of $7,943 per acre is still more than double what it was a decade ago, and economists say they expect farmland values to level off.”
The article noted that, “‘Commodity prices and farm income are settling back to more expected levels, and I think land [...]