compression waves

[Phillip L Ford]

>And as an engineer, you've never gone back in memory and experience for a
>concept or piece of information that you (possibly reluctantly) accumulated
>years ago with absolutely no practical application at the time, that proved
>to be exactly what you needed now? At any given moment, 99.99999% of our
>education is utterly useless - until a moment comes when we need some part
>of it. Which means that most of our education is useless all of the time,
>but we never know what to learn and what not to learn until it's too late.
>Though in this case, it may be too late.
>
>Ron N


Point taken.

Phil