Snopes.com
Fact-checking web site, but does it know truth?
Culture
Walter Russell
American artist and author, 1871-1963.
Textbooks used in public high schools (USA)
What are they teaching?
Craigslist
Free, online classified ads
Meetup.com
Interest groups online that meet in real life.
PETA
People for the ethical treatment of animals. Calibration of the organization and its mission.
Sperm donation
2 calibrations: the general field and the uncompensated version.
Birth Tourism
Traveling to give birth in another country in order to gain citizenship for the child.