Everyone from Darpa to the National Security Initiative seems to be dangling pots of cash in front of inventors, entrepreneurs and scientists to come up with innovative new ideas for defense and national security. Here's another contest to watch.

Global Security Challenge is sponsoring a contest to find the most promising new homeland security technology. Six security start-ups made it to the final round, and will present their inventions to judges and an audience panel on November 13. The winner takes home a $500,000 pile of cash.

Among the finalists are: Precision Sensors Instrumentation, a company from Armenia that devises sensors that are supposed to offer better prediction of earthquakes -- or armed activity. IntuView, an Israeli high-tech firm that has developed "artificial intuition" software that can scan large batches of documents in Arabic and other languages. According to the company's website, this tool can "instantly assesses any Arabic-language document, determines whether it contains content of a terrorist nature or of intelligence value, provides a first-tier Intelligence Analysis Report of the main requirement-relevant elements in the document."

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