the russian engineer konstantin tsiolkovsky, the german designer, the faithful brown american robert gotdort, but its drawing was already known in the 17th century by the book of the belarusian scientist rocket design, which this figured cuts in the fuel idea narrow juice, triangular deltoid stabilizers are still used by designers today. art of artillery came out in frankfurt am main in german in 1676 through 25 years after the death of kazimir semenovich why this direction is so interesting for many countries of the world in different regions. well, including our country for the planet, more than a third of the known mineral reserves are concentrated in africa, this is coal, oil and gas and rare earth metals are necessary for microelectronics and gold and diamonds. secondly, africa's climate and soils are favorable for agricultural development. sustainable development of agriculture. in africa , it can greatly influence the solution of the problem. this growing population is already over one and a half billion people and the growth dynamics is positive, while this is a young population. tha