Since 2014, the clearing and bulldozing of agricultural and residential lands by the Israel military close to the eastern border of Gaza has been complemented by the unannounced aerial spraying of crop-killing herbicides. Our investigation sought to answer the following questions: how do airborne herbicides travel into Gaza? How far into Gaza does it enter? What is the concentration of the herbicide that drifts into Gaza? And what is the damage to the farmland on the Gazan side of the border? -FA