Explain a failed hypothesis usefully

Given [HYPOTHESIS], [METHOD] and [OBSERVED RESULT], write a clear account of what the test can rule out, what it cannot rule out and what alternative explanations remain. Check sample, measurement and exposure before declaring the idea dead. Return a 150-word result summary, an assumption map and two next experiments ranked by cost and information gained. Do not spin a negative result into proof of success or bury it in jargon. Mark any missing protocol detail that prevents a firm conclusion.