The Download: a nuclear landmark, and China eyes Nvidia chips

This newsletter highlights the achievement of four US microreactors reaching criticality by the nation's 250th birthday. It also covers China's move to allow AI firms to purchase Nvidia chips and NATO's efforts to counter Russian cyber and physical threats.
Why it matters
The milestone in nuclear energy signals progress in emissions-free power, while the chip and defense updates reflect ongoing geopolitical tensions in technology and security.
Plus: NATO is building a network to stop Russian attackers in their tracks.
The report summarizes multiple technological and geopolitical developments using a factual, reporting-based tone without clear partisan framing.
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