What makes a Down's Syndrome person how they are.
Timmy has an extra chromosome, that's why he goes to special school.
what makes downies so special, one more chromosome changes the human body physically and mentally, also L.S has an extra chromosome. when somebody does something retarded yell out "GOOD WORK 47"
the extra chromosome explains why L.S is such a down syndrome and why he does things like a downie.