the "why"

The purpose of this challenge is to raise funds and awareness for Down syndrome (or trisomy 21), a condition in which a person's genome carries an extra 47th chromosome, instead of the usual 46. 

My little sister was born with this, and I remember how hard it was for her and my family. Even the simplest things we take for granted such as being able to feed yourself, talk or even walk were ten times more difficult for her.