Spec for cosmic radiation from CME event, coronal mass ejection. Cyclical every 6000, 12,000 years. Also could be invading army protection but stone doors wouldn't have stopped battering ram. My question, airflow?
Spec for cosmic radiation from CME event, coronal mass ejection. Cyclical every 6000, 12,000 years. Also could be invading army protection but stone doors wouldn't have stopped battering ram. My question, airflow?
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