Are you old enough to remember when everything was different, maybe even better? You are right, even what you thought was 1 kilogram has changed, leaving physicists perplexed, as this article from the Economist explains.
What I see in different shades of gray, from behind my reading glasses
Are you old enough to remember when everything was different, maybe even better? You are right, even what you thought was 1 kilogram has changed, leaving physicists perplexed, as this article from the Economist explains.