We live in an age when politicians, advertisers, and others develop and distribute fake news to sell their wares. It’s more important than ever for people to have the digital skills to check the accuracy of what they see online.

A recent study conducted by Stanford University researchers reached a sobering conclusion. Most students don’t know how to fact-check what they see online.

The University published the following survey of the results:

A new national study by Stanford researchers showing a woeful inability by high schoolers to detect fake news on the internet suggests an urgent need for schools to integrate new tools and curriculum into classrooms that boost students’ digital skills, the study’s authors say.

In the largest such study undertaken, researchers from Stanford Graduate School of Education devised a challenge for 3,446 American high school students who had been carefully selected to match the demographic makeup of the American population.

Rather than conduct a standard survey, in which students would self-report their media habits and skills, the research team came up with a series of live internet tasks. The results, published online this week in the journal Educational Researcher, highlight what the researchers say is an urgent need to better prepare students for the realities of a world filled with a continual flow of misleading information.

“This study is not an indictment of the students—they did what they’ve been taught to do—but the study should be troubling to anyone who cares about the future of democracy,” said Joel Breakstone, director of the Stanford History Education Group and the study’s lead author. “We have to train students to be better consumers of information.”

In one of the study’s tasks, students were shown an anonymously produced video that circulated on Facebook in 2016 claiming to show ballot stuffing during Democratic primary elections and asked to use Internet-enabled computers to determine whether it provided strong evidence of voter fraud.

Students tried, mostly in vain, to discover the truth. Despite access to the internet’s powerful search capabilities, just three of the study’s more than three thousand participants — less than one tenth of one percent – were able to divine the true source of the video, which actually featured footage of voter fraud in Russia.

In another task, students were asked to vet a website proclaiming to “disseminate factual reports” about climate change. Ninety-six percent failed to discover the publisher’s ties to the fossil fuel industry. Overall, the researchers found that students were too easily swayed by relatively weak indicators of credibility—a website’s appearance, the characteristics of its domain name, the site’s “About” page, or the sheer quantity of information available on a website, irrespective of the quality of that information.

“Regardless of the test, most students fared poorly, and some fared more poorly than others,” said Sam Wineburg, the Margaret Jacks Professor of Education at Stanford, who co-authored the paper. “It presents a concerning picture of American students’ ability to figure out who produced a given story, what their biases might have been, and whether the information is reliable. More troubling still is how easy it is for agents of disinformation to produce misleading—or even deliberately false stories—that carry the sheen of truth. Coupled with the instantaneous and global reach of today’s social media, it does not bode well for the future of information integrity.”

The researchers suggested potential remedies that might right the ship, including teaching students strategies based on what professional fact checkers do–strategies that have been shown in experiments to improve students’ digital savvy.

“It would be great if all students knew how to take advantage of the full web and had complete command of advanced skills like Boolean operators, but that’s a lot to ask,” Wineburg said. “If you want to teach kids to drive a car, first you have to teach them to stop at red lights and not cross double lines, before learning how a catalytic converter works. As the study shows, a lot of these kids aren’t stopping at red yet.”

It is possible to develop students’ digital literacy skills, Wineburg said. Given the risk to our democracy, it will be critical for schools to integrate these skills into all subjects, from history to math, and at every grade level.

“The kids can do it,” Wineburg said. “We must help get them there.”

The study was funded by The William and Flora Hewlett Foundation.