1syuzh. - Experiments on launching an automatic stratospheric balloon at the Aerological Institute in Slutsk; among the participants - Professor P.A. Molchanov. 2syuzh. - Testing the non-motorized combine "Stalinets", designed by the Rostov branch of the Institute of Agricultural Mechanization (Rostov). 3syuzh. - Construction of a rafting chute for timber rafting at Imanskiye logging (Eastern Siberia). 4syuzh. - Azov. Riding a water bike.