Popsugar Living School Commonly Known Facts That Are Wrong 33 Facts You Learned in School That Are Completely Wrong 22 April 2018 by Nicole Yi View On One Page Photo 5 of 33 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 5 Pluto isn't a planet. Although the small planet was reclassified in 2006 as a dwarf planet, it's still technically a planet nonetheless. Previous Next Start Slideshow SchoolScienceFun FactsNostalgia