If you stand at the South Pole, any time that the sun is visible, then any shadow is pointing North, because all directions are north!
> On 28 Oct 2016, at 07:58, Frank King <f...@cl.cam.ac.uk > <mailto:f...@cl.cam.ac.uk>> wrote: > > When you have recovered, ponder this puzzle: > > Where on the planet would you have to > be, and at what time of year, for these > instructions to give the correct result?
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