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.
Stories by Dave Levitan
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.
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.
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.
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. The vast majority of glaciers are losing ice rapidly.
Carly Fiorina said some unnamed vaccine-preventable diseases are “not communicable” and “not contagious.” Every immunization recommended by the CDC covers a highly communicable disease.
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.
Readers sent us letters regarding the contributions of human-caused and volcanic emissions of sulfur dioxide, or SO2.