People with chronic illnesses, mental health concerns, disabilities and the seasonal flu are less likely to vote.

Door-to-door canvassing campaigns actually work to persuade voters and sway national election outcomes – even when they don’t encourage more people to show up to the polls.

People with little interest in politics vote more during violent wars, a 2016 study in the American Journal of Political Science finds. Overall, people vote less if there have been few recent war deaths.