"
Because Down (not Down's) syndrome is caused by
three copies of the 21st chromosome instead of the
usual two, some bright person chose March 21 (3/21 –
get it?) for an annual celebration of World Down
Syndrome Day ..."
http://network.crcna.org/disability-concerns/lets-celebrate-people-who-have-down-syndrome
Because Down (not Down's) syndrome is caused by
three copies of the 21st chromosome instead of the
usual two, some bright person chose March 21 (3/21 –
get it?) for an annual celebration of World Down
Syndrome Day ..."
http://network.crcna.org/disability-concerns/lets-celebrate-people-who-have-down-syndrome
