How do you weigh an atom? To be honest, that's a question with plenty of problems which need answering, but one thing's certain: you need some accurate scales. Now, scientists have made a set that can measure the smallest unit of mass, the yoctogram—which is less than the mass of a single proton.
There are gadgets, and then there are gadgets. And we could write about this Multi-Function Tape Measure in italics all day long.