In this end-of-2025 roundup, we explore groundbreaking discoveries reshaping medicine and physics. New research reveals cannabis provides only minimal chronic pain relief while bariatric surgery dramatically outperforms weight-loss drugs. Scientists have precisely measured how time runs faster on Mars—a finding with major implications for space exploration—and discovered that breast cancer disrupts brain stress hormones earlier than expected. Plus: ancient Australian rocks rewrite Earth's continental origins, a potential universal antiviral emerges, and researchers engineer an antibody that makes tumors vanish in trials.

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