From Lisa Kanute, a high school English teacher in Tucson, Arizona:

Many schools were built using cinder block walls.These walls can be a challenge when trying to hang posters since it seems that nothing sticks to the cinder blocks. The answer is to use a hot glue gun. The hot glue will hold most lightweight things onto the cinder block with ease and then pops right off without any damage when you want to change things.  Plus, it's a lot cheaper than some of the other options out there. When hanging posters, just be sure to put some masking tape on the back where the hot glue is going to go so that it doesn't permanently bond to your poster. Happy decorating!

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