Thursday, May 11, 2017

Open Courses offered by Universities

Many Universities offer free open courses in Math, Science and many other Subject Areas:

 MIT Open Courses

 Yale Open Courses

Harvard Free Online Courses

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The Great Lake Huron Rock Puzzle

  As a boy, I found this chunk of limestone on the shoreline of southern Lake Huron, Canada near the town of Goderich: The rock is 23 cm (9...