Kilogram

When we weigh something, we do it in kilograms or pounds. But what is a kilogram? How much is it? Who decides, and how does that decision get carried through the entire society?

Why Isn’t a Kilogram a Kilogram?
The kilogram has changed forever. Here’s why.
The kg is dead, long live the kg
Scientists Just Redefined the Kilogram (HBO)
How We’re Redefining the kg

Bonus

World’s Roundest Object!

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