id	domain	url
dialog-171	www.pbs.org	http://www.pbs.org/parents/superwhy/program/index.html)
dialog-171	www.pbs.org	http://www.pbs.org/parents/superwhy/program/index.html
dialog-171	pbskids.org	http://pbskids.org/read/files/superwhy_research_view.pdf
dialog-171	pbskids.org	http://pbskids.org/read/files/superwhy_research_view.pdf