In the process of discovering this new phenomenon, NIST also discovered another new phenomenon it calls “fire“. (NIST explained that fire is hot). It was this new thing – fire – which led to the “thermal expansion”.
In addition, NIST has discovered a third new phenomenon called “gravity“. Gravity, NIST explains for the rapt press, makes things “fall down and go boom” really fast.
In related news, NIST – the government agency responsible for advancing measurement science, standards, and technology – has announced that nuclear reactors can be powered with play-doh and that our nation’s fighter jets can be powered by gummy bears.