The 2016 U.S. presidential candidates recently answered a slew of questions about science-related issues, offering a glimpse of their stances on everything from vaccinations to climate change to the country's growing opioid problem. Clinton said the science of climate change is "crystal clear" and the issue is "an urgent threat and a defining challenge of our For Trump, the issue of climate change was referred to in quotation marks. He said, "There is still much that needs to be investigated in the field." While the candidate noted the need for new energy sources to alleviate America's dependence on fossil fuels,...