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I found these kind of cool as an idea, as they can be added rather easily to existing cities and provide some greenery without taking up space, while providing shade:...
Via Paris Marx on Mastodon
cross-posted from: lemmy.world/post/7654367...
You can read more about the fascinating history here: about.usps.com/who-we-are/…/pneumatic-tubes.pdf...
The Polyformer is a 3D printer filament extruder created for people living in 3rd world countries with limited access to affordable filament. It allows you to recycle PET plastic from beverage containers by cutting them into a ribbon and feeding the ribbon through a heated extrusion nozzle.
The First Law...
