YouTube can be a great source of educational material to share in a learning environment.
Searching YouTube in front of a class, leaves practitioners open to the possibility that something inappropriate will pop-up.
Use http://youtube.clea.nr or the Cleaner Internet browser extension and avoid that potential problem.
Point a browser to http://youtube.clea.nr and search YouTube and watch YouTube videos without viewing any of the "related" videos or advertisements on YouTube.
Via John Dalziel