Athlete's foot is caused by a microscopic fungus that lives on dead tissue of the hair, toenails, and outer skin layers. There are at least four kinds of fungus that can cause athlete's foot.
Work. In order to accomplish work on an object there must be a force exerted on the object and it must move in the direction of the force. Energy is required to do work and the basic SI unit of energy is the joule, the amount of energy required to exert a force of 1 Newton through a distance of 1 meter (1 joule = 1 newton meter).
Create a revenue stream for the government- Government needs money for a lot of things like pay salaries to government staff who work in multiple government departments, national security and internal security (police/ fire brigades etc), education, research, health, infrastructure projects (roads, railways, airports, sea ports), subsidies etc.