[ExI] puzzle

[Ben Zaiboc]

On 02/07/2020 01:38, Adrian Tymes wrote:
> In large evaporative coolers: https://en.wikipedia.org/wiki/Yakhch%C4%81l
>
> On Wed, Jul 1, 2020 at 1:36 PM William Flynn Wallace via extropy-chat 
> <extropy-chat at lists.extropy.org 
> <mailto: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?
>

I don't know if evaporative cooling on its own could make ice, but it 
gets very cold at night in the desert, so maybe repeated exposure at 
night and insulation through the day would do it.

-- 
Ben Zaiboc

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