The two photocells are linked to the Tree: the Pre-Stage, and the Stage lights. When the car inches forward and blocks the first photocell, the Pre-Stage light comes on, indicating that the driver is close to the starting line. Most tracks have a rollout, or distance between the Pre-Stage and Stage beams of 6-8.
Eventually, children with Batten disease become blind, bedridden, and demented. Batten disease is often fatal by the late teens or twenties. Batten disease is named after the British pediatrician F. E. Batten who first described it in 1903. Also known as Spielmeyer-Vogt-Sjogren-Batten disease, it is the most common form of a group of disorders called Neuronal Ceroid Lipofuscinoses (or NCLs).
The Mad Hatter (Dr. Jervis Tetch) is a fictional supervillain appearing in American comic books published by DC Comics, commonly as an adversary of the superhero Batman. He is modeled after the Hatter from Lewis Carroll's novel, Alice's Adventures in Wonderland, a character often called the Mad Hatter in adaptations of Carroll. The Mad Hatter is depicted as a scientist who invents and uses technological mind-controlling devices to influence and manipulate the minds of his victims.