Two worlds born from the same cosmic material, nearly identical in size and gravity, have arrived at opposite fates — one teeming with oceans and life, the other a crushing, scorched wasteland. Scientists studying Venus's radar-bright highlands have proposed that its mountains may be dusted with metallic frost composed of lead and bismuth sulfides, condensed from volcanic gases at cooler elevations — a hypothesis that, if confirmed, would illuminate not just Venusian chemistry but the deeper question of why planetary siblings can diverge so absolutely. The mystery sits at the intersection of a