One way we keep costs low is by using locally available materials. That includes “organic rebar”. Concrete is an amazing thing. It can handle huge compression forces, but yet, it pulls apart very easy. It has very little tension strength. That is why for building with concrete, you need to use rebar. If you don’t, it will crack very quickly. It holds the concrete together. Well, in Cambodia, we use bamboo for road work. Bamboo does not deteriorate over time. The road will be replaced long before the bamboo will show any ware and tare. Bamboo is flexible and strong.