On Wed, Oct 6, 2010 at 5:48 AM, William Attwood <wattw...@gmail.com> wrote:
> Let's consider it a set of freeways where we want to see the health of the
> freeway system, based on the number of accidents that are slowing things
> down.

There are several real things (temperature, possibly time) which do
not "actually exist" but can be measured in aggregate.

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