On the farms of today, machines provide almost all the power. Modern farmers now have mechanized 'hired land' and keep horses only for pleasure. Besides developing new machinery, scientists and engineers have helped the farmers in many ways. For example, they have developed stronger fertilizers, more effective insecticides, and hybrid seeds which produce large, tastier fruits and vegetables. Some farmers even have computers which help them use their resources more efficiently. As a result, the farms of today are able to produce much more food with the same amount of labor. This means fewer but larger farms and fewer but more prosperous farms.