When I began writing about "Common Errors" in early January, I had little idea how many there would be! It seems that there are more erroneous views in everyday currency than I had supposed possible. However, a series became a book. I decided to stop at 101, for in Room 101 of Orwell's "1984" is the thing that everyone fears most. In this case it is the plausible assumptions that are completely mistaken. By coincidence the starter courses in US universities and colleges are often designated 101 courses. The series which became a book is now "Freedom 101" and you can read about it here.