It's amazing what an extra chromosome can do.

Humans typically have 23 pairs of them, but some people have 22 matched pairs and a set of three. That genetic sequence often leads to Down syndrome. While medical books call this phenomenon "trisomy," parents usually prefer the term "miracle."

All GIFs via Wouldn't Change a Thing/YouTube.

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AnnaRose Rubright is a 19-year-old college student in New Jersey. She works part-time, has five younger sisters...

...and is the star of a new viral PSA in honor of World Down Syndrome Day on March 21, 2016.

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