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Dark matter could be an entire dark sector of the universe, with its own particles and forces. Hear from physicist Kathryn Zurek, who proposed the dark sector theory, how this shadow world might operate, and how researchers are designing new types of experiments to search for it. This session is based on this issue feature article: The Hidden World, April 2025. Read the article here: https://www.scientificamerican.com/article/dark-matter-may-be-a-whole-shadow-world-of-mysterious-atoms-and-forces/