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Japan Is Building Cardboard Suicide Drones
(www.404media.co)
This is a most excellent place for technology news and articles.
This will never fly in Seattle! Too wet.
I saw the cardboard festival tent hold up to a couple days of rain. Thats probably more than the maximum mission time it needs.
There are cheap and easy ways to waterproof cardboard, but I'm not sure why you would want to attack Seattle.
Microslop has its headquarters there. That's enough reason to flatten the city and salt the earth.