You’ve probably seen it dozens of times—the jagged, ridged section between the handles of your kitchen scissors—and never given it much thought. But this small, hidden feature is far more useful than you think.


You’ve probably seen it dozens of times—the jagged, ridged section between the handles of your kitchen scissors—and never given it much thought. But this small, hidden feature is far more useful than you think.

A study desk with books, pens, and a lamp sounds like the easiest possible setting for a spot-the-difference puzzle. Yet that very familiarity is…