On Monday, August 24, 2015 at 6:27:34 PM UTC-7, graham wrote:
> On 24/08/2015 7:15 PM, Sqwertz wrote:
> > On Mon, 24 Aug 2015 18:33:39 -0600, graham wrote:
> >
> >> On 24/08/2015 4:59 PM, Xeno wrote:
> >>> On 25/08/2015 8:08 AM, Dave Smith wrote:
> >>>> On 2015-08-24 5:30 PM, wrote:
> >>>>
> >>>>> If I were John, I would send away for a replacement set
> >>>>> of the Capresso burrs (Swiss), and figure out how to retrofit
> >>>>> his B&D burr grinder with them. Because burrs don't last forever.
> >>>>>
> >>>>
> >>>>
> >>>> Oh sure. Those coffee beans are so much tougher than the steel burrs.
> >>>
> >>> Swing by the Grand Canyon next time you're in the area. Water erodes
> >>> stone! ;-)
> >>>
> >> Actually, it's the sediment carried by water that erodes stone.
> >> Graham

How about cavitation erosion?

> >
> > Water without any sediment, water is still very effective in erosion.
> > If you pour a bucket of water into a pile of dirt, what happens? The
> > force of fast moving water is very effective at wearing away rocks.
> >
> Oh, Sorry! I must be out of date then. After all, I received my geology
> Ph.D 45 years ago and have been working in the profession since then.
> Graham

So would it be fair to say your head is chock full of rocks, after
a half-century of studying them?