surfboard from algae
tighter cell pattern that makes them harder, more flexible, and more buoyant" I agree Udo, would think harder would mean less flex, tighter cell pattern would mean less air voids , which would equate to less bouyant?
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interesting story on attempts to create environmentally sustainable boards
https://www.outsideonline.com/1974621/your-next-surfboard-will-be-made-a…