Significant digits in a float?

[emile]

On 04/30/2014 11:21 AM, Grant Edwards wrote:
> On 2014-04-29, emile <emile at fenx.com> wrote:
>> On 04/29/2014 01:16 PM, Adam Funk wrote:
>>
>>> "A man pitches his tent, walks 1 km south, walks 1 km east, kills a
>>> bear, & walks 1 km north, where he's back at his tent.  What color is
>>> the bear?"  ;-)
>>
>>   From how many locations on Earth can someone walk one mile south, one
>> mile east, and one mile north and end up at their starting point?
>
> I'm pretty sure there are places in London like that.  At least that's
> what it seemed like to somebody from the midwestern US where the
> streets are layed out on a grid.

I was going to bring up London, but as I recall from my brief visit 
there, I wasn't sure you could go one mile straight in any direction.

:)

Emile