The four-square-mile fossil forest — the largest find ever — is just south of Danville in Vermilion County, Ill., in the 300-million-year-old Herrin coal bed, a 6-foot-thick strip mined by a subsidiary of St. Louis-based Peabody Coal.
No photos; but a graphic about how they believe it happened."
Carson said MIT's teachers collect what they have created for their courses and make it available over the Web. Many online learners purchase text books for the courses they are monitoring and a recent MIT-Amazon link showed that about 2,000 text books were ordered by independent learners, demonstrating just how serious the learners are.
"Video and audio files are very popular," said Carson. "There are 21 courses with full video available." Typically, independent learners view videos with streaming media players and replay them on PCs, MP3s, or iPods."
Higher animals use some form of an "internal model" of themselves for planning complex actions and predicting their consequence, but it is not clear if and how these self-models are acquired or what form they take. Analogously, most practical robotic systems use internal mathematical models, but these are laboriously constructed by engineers. While simple yet robust behaviors can be achieved without a model at all, here we show how low-level sensation and actuation synergies can give rise to an internal predictive self-model, which in turn can be used to develop new behaviors."