Article 50. The State shall establish Juche in scientific research, introduce advanced science and technology in every possible way, increase State investment in the area of scientific research, open up new areas of science and technology and raise the country's science and technology to the world level. Article 51. The State shall elaborate a correct plan to develop science and technology, set up a strict discipline to implement it, and strengthen creative cooperation among scientists, technicians and producers. Article 52. The State shall develop Juche-oriented, revolutionary art and literature, national in form and socialist in content. The State shall encourage creative workers and artists to produce works of high ideological and artistic value and enlist the broad sections of the masses in literary and artistic activities. Article 53. The State shall provide sufficient modern cultural facilities to meet the demands of the people who want to continually improve themselves, both mentally and physically, so that the working people enjoy a full socialist cultured, aesthetic life. Article 54. The State shall safeguard our language from all attempts to obliterate it and shall develop it to meet present-day needs. Article 55. The State shall thoroughly prepare all the people for work and national defence by popularizing physical culture and sport and making it their daily regime, and augment sporting skills to meet our country's reality and the trend in modern sporting skills. Article 56. The State shall protect the people's lives and improve the working people's health by consolidating and developing the system of universal free medical service, improving the district doctor system and the system of preventive medicine, and improving the provision of materials for public health purposes. Article 57. The State shall adopt measures to protect the environment, giving it preference over production, preserve and promote the natural environment and prevent environmental pollution so as to provide the people with a hygienic living environment and working conditions. CHAPTER IV. NATIONAL DEFENCE Article 58. The Democratic People's Republic of Korea is shored up by the all-people, nationwide defence system. Article 59. The mission of the armed forces of the Democratic People's Republic of Korea is to defend to the death the Central Committee of the Party, headed by the great comrade Kim Jong Un; to safeguard the interests of the working people; and to defend the socialist system and the gains of the revolution, freedom, independence and peace of the country from foreign aggression.