It’s official! The definition of the kilogram (and a few other units) is being changed next May. Specifically, our buddy the kilogram will now be defined using the Planck constant as opposed to Le Grand K, the physical object that has been the kilogram since forever.

Very cool. Kinda sad, though. The kilogram will still be my favorite SI base unit, even though some of its uniqueness is being stripped away for more precision. Not that that’s a bad thing, but still…