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Such models must avoid unstable or unphysical fields at the bounce while matching observations.","posed_since":"","precise":"Construct a geodesically complete bouncing or ekpyrotic cosmology, free of ghost and gradient instabilities and under effective-field-theory control through the bounce, that predicts $n_s = 0.974 \\pm 0.003$, $r < 0.036$ and $\\mid f_{\\mathrm{NL}}^{\\mathrm{local}}\\mid < 10$. Answer yes with an explicit model, or no with a no-go theorem for a defined class.","problem_ref":null,"references":"","settled_by":"An explicit stable model with computed spectra, or a no-go theorem covering scalar-tensor bounces.","status_note":"","title":"Can a nonsingular bounce reproduce all observed primordial 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