Bamboo has hearts 
at every external ring. Indians and rural people in central and south america, as well as south east asia and africa use bamboo as condiuits for water. But first there has to be a long hard object pass through the bamboo to to PIERCE the Hearts(solid discs, dividing the bamboo into sections).. Once the hearts are broken, bamboo can be used to spread water throughout the village.` The heart is designed to maintain the water only for each individual section. Bamboo without broken hearts are only good to it´self, not to others…..Hummmmm, that´ll preach!