In the old days, the idea of travel or taking a holiday was the monopoly of the privileged few. Today, science has given us the steamer, the aircraft and the motor-car. New horizons are opened to us and the increase of wealth brought about by science has given us the means to enjoy the new leisure we have been given. But to enjoy life at all, we must be healthy and it is perhaps in the sphere of medicine that some of the greatest advances have been made. Today, because of the use of antibiotic and isotopes, many diseases are speedily cured and man has become, on the whole, a healthier being, set free from pain and illness. Science has been completely beneficial to ordinary living when properly applied. When misused, it is equally harmful. Land can be poisoned by chemicals, workers can suffer industrial disease, war can mobilize science to man's own destruction. Science is a good servant, but man must remain master.