To mark World Down Syndrome Day on March 21, Fox News contributor Tom Shillue headed to Times Square to speak with a father of a girl with Down syndrome about common misperceptions.

Down syndrome itself is a genetic condition caused when an unusual cell division results in an extra full or partial copy of chromosome 21, according to the Mayo Clinic.

Down syndrome communities have built strong followings on social media, using well-known hashtags like #DownSyndrome and #DownSyndromeAwareness to connect and share their stories.