Answer

Stumper #11

A

What is it?
It is the kilogram.
The standard is kept in a vault at Le Bureau International des Poids et Mesures, Sevres, France. Copies accurate to within + or - 40 parts per million are made for countries needing to recalibrate their reference standards.

B

What is it made of?
It is a chunk of platinum and iridium

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