Peruvian puquios were a “hydraulic system constructed to retrieve water”
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"The puquios were the most ambitious hydraulic project in the Nasca area and made water available for the whole year, not only for agriculture and irrigation but also for domestic needs,” says Lasaponara, who has written about her satellite studies in Ancient Nasca World: New Insights from Science and Archaeology, which is due to be published later this year.

The origin of the puquios has remained a mystery to researchers because it was not possible to use traditional carbon dating techniques on the tunnels. Nor did the Nasca leave any clues as to their origin. Like many other South American cultures they had no writing system.

Their existence tells us something remarkable about the people who lived in the Nasca region from before 1,000 BC to AD750. “The construction of the puquios involved the use of particularly specialised technology,” says Lasaponara. Not only did the builders of the puquios need a deep understanding of the geology of the area and annual variations in water availability, maintaining the canals was a technical challenge as they spread across tectonic faults.

"What makes them even more remarkable is that they still function today"

Had They Bet on Nuclear, Germany and CA Would Already Have 100% Clean Power
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isn't it a bit of a stretch to call nuclear power "clean"?

Absolutely. The call out is in the comments.

https://www.thelocal.se/20151004/swedish-politician-attacked-by-fearless-weasel good praxis

TIL that a female zebra shark held in captivity in Australia gave birth asexually in 2017. It is only the third documented case of a vertebrate of any species switching its reproductive strategy from sexual to asexual. Sperm storage was ruled out when genetic testing was done on the offspring. [Source: https://www.sciencealert.com/zebra-shark-makes-world-first-switch-from-sexual-to-asexual-reproduction]