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Comment by skybrian | Hacker News Reader
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skybrian
·
Could you say more about these "better technologies?"
View on HN
bsder
·
Rubber balls!
https://www.youtube.com/watch?v=uxPdPpi5W4o
hugh-avherald
·
The video explicitly says this is not used to reduce evaporation.
winkeltripel
·
Pipes?
Reply on news.ycombinator.com