@heafnerj
Joe Heafner wrote:
> <em> I’m (re)reading Ch. 2 of Laurent’s Intro. to #Spacetime [...] </em>

But have you read Ch. 1 ?

Should students swallow this defeatism:
<blockquote> For us it suffices in principle as a definition of [#Duration as measure of] time to point at Big Ben and say: ‘That's a clock; it measures time’. </blockquote>
?? ...

No!: it can + should be taught what motivates e.g. the #MarzkeWheelerClock

Moreover: Why + How to improve on that!
#Relativity #TeachRelativity