Like watching a silent assassin in slow motion, this model allows viewers to peer inside an oversized artery and witness a grim series of events unfold. First, blood cells struggle to flow through the artery, which is clogged with thick, butter-colored plaque. As blood flow decreases, more blood cells pile up in the ever-narrowing gap. Finally, the cells stop moving altogether and—bam!—it’s a heart attack. There’s not a more sobering reminder of the importance of cholesterol control.