"Strong typing vs. strong testing"

[RG]

In article <Z9ednf_oe76E9CjRnZ2dnUVZ_vednZ2d at speakeasy.net>,
 rpw3 at rpw3.org (Rob Warnock) wrote:

> RG  <rNOSPAMon at flownet.com> wrote:
> +---------------
> | This reminds me of back when I was a kid and my dad was trying to teach 
> | me basic physics.  He kept saying that the acceleration of gravity was 
> | 9.8 meters per second squared and I just couldn't wrap my brain around 
> | what it meant to square a second.
> | 
> | Now that I think about it, I still can't.  :-)
> +---------------
> 
> Write it our longhand and it's easier to grok:
> 
>     9.8 m/s^2 ==> 9.8 m/(s*s) ==> 9.8 m/(s*s) ==>
>     (9.8 meters per second) per second.
>      \                   /
>       \__ speed added __/   per second

Oh, that part I get.  It's the abstract squared second that's still a 
deep mystery to me.  A squared length is easily visualized.  But 
according to relativity space and time are just two aspects of the same 
thing, so a squared second should make some kind of physical sense.

rg