Well it seems this week could be the end of the current kilogram standard - a lump of metal that has defined the amount of mass that is called a kilogram.
It’s being replaced by a definition based on Planks constant and measured using a special balance that uses electromagnetic force.
This is pretty big news. Mass was the last of the units that had a single physical object defining it, the others such as length and time had all changed to a definition based on a physical property that in theory could be measured by anyone.
The existing lump of metal was created in 1889, replacing another one made in 1799 - so this is a change in technology to replace something that’s been used for over 200 years. Amazing that it’s the last to change and taken so long.
The change won’t actually happen for a while, this week is the vote to decide if this change should happen. Still it’s pretty important and marks a new era in measurements.