Better teaching: Sharing

"When you make content available on line, it supports everyone: athletes, struggling students, parents wanting to help, sick students...etc"

We expect students to collaborate all the time - so why not teachers?
Why don't teachers share Blog post from  
The Silo Mentality: How To Break Down The Barriers   The Silo Mentality as defined by the Business Dictionary is a mindset present when certain departments or sectors do not wish to share information with others in the same company. This type of mentality will reduce efficiency in the overall operation, reduce morale, and may contribute to the demise of a productive company culture.
From Equally valid for education