Invention Convention in Mr Johnson's 7th grade Engineering Technology class! #STEM https://t.co/SUsZj7g0uZ http://pic.twitter.com/jPF2jWpaWl
— Pine Grove Middle (@PGMVikings) September 7, 2016
from Twitter https://twitter.com/PGMVikings
September 07, 2016 at 11:03AM
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