Significant digits in a float?

[Roy Smith]

In article <5360672e$0$29965$c3e8da3$5496439d at news.astraweb.com>,
 Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:

> On Tue, 29 Apr 2014 19:31:31 -0700, Ethan Furman wrote:
> 
> > Perhaps my geography is rusty, but I was under the impression that one
> > cannot travel south if one is at the South Pole (axial, not magnetic).
> 
> Possibly with a rocket aimed straight up.

No, with a rocket aimed straight up, you go north.  To go south, you 
need a rocket aimed straight down.