Instructions: Click empty space to create a belief node. Click a node to select it, then use the sliders to set its truth value. Drag from one node to another to create an inference link (implication). Click "Add Evidence" to inject positive or negative evidence at the selected node — watch confidence propagate through connected beliefs. The NAL revision formula updates all connected nodes: w=c/(1-c), f_new=(w1*f1+w2*f2)/(w1+w2), c_new=(w1+w2)/(w1+w2+1).