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"Santorum's Health Care Stall Tactic: 'Offer Literally Thousands of Amendments' to Keep Senate in Session for Months". www.mediamatters.org. February 27, 2010.
Director of the Future of Humanity Institute Nick Bostrom, Nick Bostrom (2013). “Anthropic Bias: Observation Selection Effects in Science and Philosophy”, p.1, Routledge