This unit, developed by the Third World Science Project, is designed to add a multicultural element to existing science syllabi (for students aged 11-16) in the United Kingdom. The project seeks to develop an appreciation of the: boundless fascination of the natural world; knowledge, skills, and expertise possessed by men/women everywhere; application of knowledge and skills to solve the practical problems of everyday life; impact of modern technology in the world; and the influence of the cultural background on the perception of knowledge, problems, and solutions. The unit (which assumes students have previously been introduced to energy and its different forms) focuses on different types of energy convertors which can be related to the Third World. The introduction explains how unconventional energy courses may help Third World countries to improve their agricultural methods and living standards, proceeding with discussions of energy sources, importance of photosynthesis/plants, raising of water by muscle power, and other devices which make use of muscle power. Other types of energy convertors widely used in underdeveloped countries are the described, including water wheels, wind energy, and solar energy. The unit concludes with list of addresses to obtain detailed information to construct energy converts in the school laboratory. (JN)