It began early this week when a Twitter user named Em tweeted the equation 8 ÷ 2(2 + 2) = ?. Many calculated the problem and came up with an answer of 16. But others did the math just as confidently ...

Math equations can feel like a banal abstraction without images to make sense of the strings of numbers, letters, and Greek symbols. Consider the Pythagorean theorem, an essential relation in geometry ...