1st FDC: Maxwell´s Equation, Magnetism Electricity Einstein, Nobel Prize, Physics, Mathematics, Theory of Relativity Egyptian Using Fingers to Count, Mathematics, Egyptology, Human Brain, Tsiolkovski´s Law of Speed of Rocket, Space, Parachute, Map Newton´s Law of Gravity, Apple, Fruit, Astronomy Nicaragua RARE FDC 1971
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2nd FDC: Thermonuclear fusion research on Tokamak, Pythagoras Theorem, Compass Devider, Mathematics, Hourglass, Freemasonry, Masonic Symbol Boltzmann, Physics, Equation of Movement of Gases, Mineral, Energy Napier´s Equation, Logarithms Archimedes, Displacement of Mass, Balance Louis de Broglie, Nobel Prize, Physics Nicaragua RARE FDC 1971