Boy's rare disease turns his muscles to bone

I was surfing the web when I found this depressing story about a kid's muscles, tendons, ligaments, and body tissues turning to bone. It made me cry very hard. It's the cruelest disease I have ever heard of. It's known as Fibrodysplasia ossificans progressiva (FOP), and sometimes referred to as Stone Man Syndrome. God bless this innocent cutie. 
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