Daily briefing: Why all living cells emit a faint glow

TL;DR - Nature’s daily science briefing highlights possible cell-to-cell communication through faint “biophoton” emissions, a brain mechanism that tracks sleep, and accountability in physician–AI collaboration.

• Living cells emit faint light that might help them communicate with neighboring cells.
• A brain “timer” reportedly tracks sleep.
• The briefing raises questions about responsibility when clinicians and AI systems work together.
• The provided excerpt does not include methods or detailed findings.