Season 4 Episodes8
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Ranked #6 of 8 in Season 4•matches the season avg
Scientists attempt to understand how this strange force of magnetism works.
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"Forces of Mass Construction" is episode 8 of How the Universe Works season 4. It scored 8.5/10 from 94 votes, ranking #6 of 8 episodes this season (season average 8.5). It aired on September 1, 2015.