The researchers wanted to find out if they could predict the durability of biofuel pellets using simple tests on individual pellets. They tested different methods and found that the strength of a single pellet can help predict how well it will hold up to industry standards. They discovered that the density and durability of a pellet are key factors in determining its strength, and that compressive strength alone is not a reliable indicator of pellet durability. This information can help improve the quality of biofuel pellets used in industrial processes.