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"Educational technology companies and entrepreneurs may face the risk of a "tech bubble," similar to the massive boom-and-bust that rocked the technology market in the late 1990s, according to market analysts and a recently released paper. A relatively new focus on K-12 educational technology as an investment vehicle, a surge of investors looking to cash in on the latest innovations, and fewer barriers to developing an ed-tech business have merged in ways that have some market observers wary of what's ahead. The flurry of activity is prompting comparisons to the dot-com crash of the late 1990s, which brought the failure of many technology-related businesses that had drawn huge sums of money from investors. "

The Evolution of Cognition William L. Benzon and David G. Hays Abstract: With cultural evolution new processes of thought appear. Abstraction is universal, but rationalization first appeared in ancient Greece, theorization in Renaissance Italy, and model building in twentieth-century Europe. These processes employ the methods of metaphor, metalingual definition, algorithm, and control, respectively. The intellectual and practical achievements of populations guided by the several processes and exploiting the different mechanisms differ so greatly as to warrant separation into cultural ranks. The fourth rank is not completely formed, while regions of the world and parts of every population continue to operate by the processes of earlier ranks.