For fun and research you can make your own simple "lie detector" - a device which measures the leven of skin conductance of the user with two simple sensors. The theory of lie detection in this instance is that the greater the conductance - the increased chance the subject under test isn't telling the truth.
Nevertheless the device is easy to make and would be fun for younger enthusiasts to experiment with - the two sensors are made from coins and connected to the Arduino's analogue input - which can easily measure the changing skin conductance thanks to the returned voltage through the human.
Looking for a rapid-use LCD for your Arduino or compatible development boards such as the example above? Save time and move forward with the Freetronics LCD & Keypad shield which contains a bright 16x2 character LCD and five buttons that can be read from only one analogue input pin: