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This personality is the father of radio science and has pioneered Bengali science fiction in the country. He invented the crescograph, a device that measures growth in plants. Identify him.
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SNAP Indian National Static GK
SNAP Invention and Discoveries
SNAP Probability, Combinatorics
SNAP Averages, Ratio and Proportion
SNAP Functions, Graphs and Statistics
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SNAP Logarithms, Surds and Indices