Most of us can't even begin to imagine what it's like to be living with a terminal illness. Having witnessed the bravery that it takes and the value of keeping a smile on your face firsthand, I was incredibly touched by the story of Zach Sobiech.

Zach suffered from a rare childhood cancer, he was diagnosed at 14 years old. Instead of giving up and being depressed, he embarked on an incredible journey to leave a legacy that most of us don't even achieve in decades.

Zach passed away yesterday. Watch his incredible story: