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The article discusses the importance of dispersion and scintillation in radio astronomy. It explains how dispersion can be used to understand the geography of the galaxy and signals from distant galaxies by analyzing the wavelength dependence of the dispersion measure. The article also mentions that dispersion played a role in determining that fast radio bursts originated from beyond the Milky Way. Additionally, it highlights the role of dispersion and scintillation in answering questions about dark matter and mapping out the invisible matter in the universe. The article also briefly mentions the variability in light of Mira Ceti and the temperature of sunspots. [Extracted from the article]