National Institute of Standards and Technology

Why do login systems permanently lock out real users? A look at the hidden design failures behind OTP dead ends and circular recovery flows.

One photo, one reference ruler, and a geometry trick from 1999 that measures objects without any AI at all.

A listener wants to put a number on his spudger's tip thickness. Turns out that's a real metrology problem.

A millimeter is the last unit you can feel. Below it, the trades borrow microns, mils, and angstroms — and the atom is a different regime entirely.