Mail-in voting is one of the major modern conveniences afforded to US voters, but with Election Day less than a week away, it might be too late in some states to request a mail ballot if you haven’t already. Mail-in ballots — known sometimes as “absentee ballots” — are an increasingly common method of voting, with the COVID-19 pandemic pushing way more people than ever before to consider the option. Voting by mail had been steadily increasing for years, but according to the Election Lab at the Massachusetts Institute of Technology,…