In a short time, a lie detector is assembled in the technology - egg, which can be tested immediately at the Easter celebration with parents, relatives and friends. The assembly is simple and works completely without soldering. The principle behind it is the following: When a person tells a lie, he becomes nervous, which causes his blood pressure and heart rate to rise. In addition, he begins to sweat. And the lie detector makes use of this sweating, because it changes the skin resistance. The enclosed instructions make the setup child's play and also explain how the lie detector works.