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"Biosignatures" as a book category encompasses works that center on the signals, markers, and evidence of life—molecular, structural, chemical, or behavioral—and the methods we use to find and interpret them. It spans non‑fiction treatments of astrobiology (how we search for life on other planets), microbiology and medicine (biomarkers for disease), environmental science (ecological indicators and pollution signatures), forensic detection, and synthetic biology, as well as fiction that imagines new forms of life or the discovery of life beyond Earth. Books in this category explore the instruments and techniques (from genomics and spectroscopy to remote sensing), the scientific and philosophical questions they raise (what counts as "life"), and the societal, ethical, and practical implications of detecting—or failing to detect—biosignatures.

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