Peter Schumer does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

The letter “x” often symbolizes something unknown, with an air of mystery that can be appealing. Illustration by Meilan Solly Even though “x” is one of the least-used letters in the English alphabet, ...

William Liang At the sixth-ranked American public university, UC San Diego, a quarter of students taking a remedial math course placement exam couldn’t solve for x in this equation: 7 + 2 = x + 6. A ...

Community Notes, the crowdsourced fact-checking program launched a year ago to tackle disinformation on X (formerly Twitter), has flown under the radar for much of its existence. But in the past week ...