Liquid nitrogen is a well-known cryogenic coolant, boiling at 77K (-196C). At such a low temperature it is possible to show a variety of interesting demonstrations, including gases changing into liquids and vice versa. Materials can change dramatically at these low temperatures, as can be seen with experiments on such everyday objects as tennis balls, bananas, bells and batteries. Striking electrical demonstrations are possible at liquid nitrogen temperatures including the “jumping ring”, which demonstrates Faraday’s laws of electromagnetic induction. The speaker will also discuss some of the principles behind obtaining low temperatures, and his presentation will conclude with the spectacular “liquid nitrogen monster”.