Design a detailed cartoon avatar of a mad scientist with a wild and unkempt appearance, with tufts of hair sticking out in various directions, and wearing a tattered lab coat over a button-up shirt and suspenders. The scientist should be depicted holding a test tube filled with a glowing, bubbling liquid, with a crazed expression on his face, and his eyes widened in excitement. The avatar should be in full color and have a bold, striking appearance that captures the essence of a mad scientist who is lost in his experimentation and discovery.