Science Quickly Nuclear doubts, bigger hail, and new clues about aging brains
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Mar 16, 2026 Dan Vergano, senior editor at Scientific American and science journalist covering energy and geopolitics. He breaks down why experts say Iran was not close to a bomb. He explains the global oil reserve release and its strategic ripple effects. New research on climate-driven larger hail gets discussed. A study linking aging gut microbiomes to brain decline in mice is also covered.
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Why Iran Wasn't On The Cusp Of A Bomb
- Iran's uranium enrichment level matters more than possession of uranium for weapon timelines.
- Iran had 441 kg at 60% enrichment and, before June 2025, could have reached 90% in ~3 weeks using active centrifuge cascades.
Enrichment Alone Doesn't Make A Usable Weapon
- Weaponization also requires delivery systems and suitable weapon material form, not just enriched uranium.
- 60% uranium can make a low-efficiency device that's heavy and hard to deliver, and Iran hasn't perfected a reliable ballistic missile for such a payload.
Black Rain From Burned Oil Harms Lungs
- Bombing oil fields causes immediate and long-term human health harms from smoke and particulates.
- Dan Vergano cites Kuwait oil field burnings: short-term respiratory effects and possible long-term increases in cancer and asthma.