Great NIST article entitled “A Turning Point for Humanity: Redefining the World’s Measurement System (SI)”. In November 2018, the world’s measurement experts will revise the metric system based on speed of light and other “constants” of physical science. These constants are central to a set of well-established scientific principles. They are the backbone of our ever-expanding knowledge of natural laws, such as Einstein’s well-known E = mc2, which describes how mass and energy behave throughout the universe.
These scientific principles are the same ones we’ve already used to create a modern world where we watch flat panel TVs, navigate deep space and explore quantum computing. And this revised measurement system promises to help lead to technological innovations we cannot yet imagine.
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This wallet card displays the fundamental constants and other physical values that will define a revised international system of units. 
(Credit: Stoughton/NIST)
