[ExI] puzzle

[SR Ballard]

Ice will form by itself overnight in the desert. 

SR Ballard

> On Jul 1, 2020, at 4:55 PM, Will Steinberg via extropy-chat <extropy-chat at lists.extropy.org> wrote:
> 
> Kites, maybe?  I thought evaporative coolers in the desert could keep ice but not make it
> 
>> On Wed, Jul 1, 2020, 16:35 William Flynn Wallace via extropy-chat <extropy-chat at lists.extropy.org> wrote:
>> Here is one I ran across in an article on air conditioning.  In ancient Egypt ice was made.  How did they do it?
>> 
>> bill w
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