Missing: two apostrophes.

Maybe the writer (of "Striking B.C. teachers rally at Vancouver Art Gallery" on CBC News online on March 7, 2012) was determined to keep apostrophes out of this paragraph entirely. But in doing so, two errors occurred. First, an apostrophe should have been present in B.C. Teachers' Federation, and second, an apostrophe should have been present in the province's 41,000 teachers. Click the image to enlarge it.