[ExI] chain rule

[Dave Sill]

On Fri, May 20, 2016 at 12:25 AM, spike <spike66 at att.net> wrote:

> Khan Academy is free; anyone can sign up for an account, do exercises,
> listen to lectures or work on programming projects.  It remembers your
> progress.  You can leave it and come back a couple years later; everything
> will still be there.  Sal Khan set up a really useful valuable free
> education for anyone who wants to reach out and take it.  Anywhere in the
> world, any socio-economic class or any station in life: everyone has a shot
> at a ton of good stuff.  Check it out:
>
> https://www.khanacademy.org/
>
Cool, thanks. Don't know how I've managed not to run into that before.

-Dave
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