And now for the science bit...

picture of grandchildren
It's wonderful when children begin to become enthralled with science-based activities, even if they don't understand how/why it happens.  Here's my granddaughter, Amie, explaining how to stick a balloon to the wall.








For the real science bit, here is how it happens.  When a balloon is rubbed against the hair it becomes negatively charged.  When near a wall, the charged balloon is attracted to positively charged particles in the wall and can "cling" to it.  
Source:  Wikipedia

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