A Project of The Annenberg Public Policy Center

The Facts About Zika

Several members of Congress wrote to government officials about the recent Zika virus outbreak in Brazil and a suspected rise there in the number of microcephaly cases. But some of those letters overstated what’s known about these two phenomena.

Cruz’s ‘Pseudoscientific’ Climate Claims

While on the campaign trail in New Hampshire, Republican presidential candidate Ted Cruz gave a speech to local residents that contained inaccurate and misleading claims about climate science and its terminology.

Video: Climate Change Claims

In this video, FlackCheck.org reviews some of the false and misleading claims about climate change that we have written about for our SciCheck feature.

Climate Change Review

With the recent climate change agreement in Paris, we provide here a recap of false and misleading claims about climate change that we have fact-checked in recent years.

Ethanol: Higher Emissions or Lower?

In dueling TV ads, foes of the federal ethanol mandate claim that it “doubles greenhouse gas emissions,” while the ethanol lobby says that “the oil industry is lying” and the mandate will lead to lower emissions.

Sanders on Climate Link to Terrorism

Sen. Bernie Sanders went too far with his debate claim that “climate change is directly related to the growth of terrorism.”

DEA Chief Wrong on Medical Marijuana

The acting head of the Drug Enforcement Administration claimed that smoking marijuana has “never been shown to be safe or effective as a medicine.” That’s false: though information is limited on the topic, several studies have found smoked marijuana has medical benefits and mostly mild side effects.

Smith Misfires on Climate Science

The chairman of the House Committee on Science, Space, and Technology has made several inaccurate or misleading claims about climate science in an ongoing battle with the National Oceanic and Atmospheric Administration.

Clinton Off on Late-Term Abortions

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.

Carson Rewrites Laws of Thermodynamics

Ben Carson claimed that prevailing theories of how the universe began and how planets and stars formed violate the second law of thermodynamics. His comments represent a misunderstanding of scientific concepts.