Hillary Clinton said that late-term abortions “are because of medical necessity.” There is little research on the subject, but existing data do not support her claim. Read more»

Republican presidential candidates Carly Fiorina and Donald Trump were challenged on false claims they made during the second Republican debate, and both doubled down with more misinformation. Read more»

Sarah Palin says man isn’t to blame for climate change, citing the fact that some glaciers in Alaska are expanding. But an individual glacier’s growth does not disprove the existence or causes of global warming. In fact, the vast majority of glaciers in Alaska and around the world are losing ice rapidly. Read more»

Carly Fiorina recently said some unnamed vaccine-preventable diseases are “not communicable” and “not contagious,” and some immunizations are not “necessary” for school-age children. The fact is that every immunization recommended by the Centers for Disease Control and Prevention covers a highly communicable disease. Read more»

Senate Minority Leader Harry Reid has said at least twice that climate change is causing bears in the Sierra Nevada mountains to change their hibernation patterns. There is no evidence that climate change is actually having such an effect. Read more»

Mike Huckabee claimed that a single volcanic eruption “will contribute more than 100 years of human activity” toward global warming. This is far from accurate. Humans actually pump upward of 100 times as much carbon dioxide into the atmosphere every year than all the world’s volcanoes combined. Read more»

A Republican congressman says the EPA wants “to stop you and I from grilling,” and he has proposed legislation that would prohibit federal regulation of backyard barbecues. Rep. Richard Hudson cites an EPA “study,” but that is actually a student design project; the agency says it has no plans to regulate barbecues. Read more»

Jeb Bush claimed that the science is unclear as to how much humans contribute to global warming. Read more»

A number of Republican House members say scientific research proves a 20-week-old fetus can feel pain. But the ability to feel pain at that specific point in gestation is unproven. Read more»

Rep. Lamar Smith, R-Texas, made several incorrect claims in a Wall Street Journal opinion piece regarding connections between climate change and severe weather. Read more»

Chris Christie said that marijuana is a “gateway drug” while arguing for enforcement of its federal status as an illegal substance. Though there are correlations between marijuana use and other drugs, there is no conclusive evidence that one actually causes the other. The science on this topic is far from settled. Read more» 2

President Barack Obama says that 2014 was “the planet’s warmest year on record.” But that’s not entirely accurate. Read more»

Rick Santorum misrepresented the EPA’s impact analysis of a new agency rule that would reduce power plant emissions of mercury and other toxins. Read more»

During his critique of NASA’s spending on earth and atmospheric sciences at a recent committee hearing, Sen. Ted Cruz made some misleading claims regarding the agency’s budgets and the science that it conducts. Read more»

FactCheck: The head of the Environmental Protection Agency told Congress her agency’s proposed rules governing carbon dioxide emissions from power plants will not affect the reliability of electricity service. That’s debatable. Read more»