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Oct 10 13 tweets 5 min read Read on X
Oct 9, 2025: China's Ministry of Commerce issued Announcements No. 61 & 62, expanding rare earth export controls to 12 of 17 elements and imposing extraterritorial licensing requirements.

This is direct retaliation for U.S. semiconductor export bans announced days earlier.

China controls 70% of global mining, 90% of processing, and 93% of permanent magnet production. Each F-35 requires 417kg of rare earths. China refines 100% of global samarium.

What does this mean for U.S. defense? How will this affect AI data centers? What happens to semiconductor and EV supply chains? Let's dive in:Image
1/12: TIMING IS EVERYTHING

The announcement came days after U.S. expanded chip export bans (Oct 7, targeting ASML/TSMC) and weeks before two critical deadlines:

• 90-day U.S.-China trade truce expires
• Trump-Xi meeting in South Korea

Strategic retaliation designed to maximize Beijing's leverage in upcoming negotiations.
2/12: RARE EARTHS 101

17 elements (lanthanides + yttrium/scandium) critical for high-tech applications—magnets, lasers, semiconductors.

They're not "rare" geologically, but incredibly hard to process:
• Only 0.1-1% concentration in ore
• Creates radioactive byproducts (thorium), driving up environmental and political costs

China dominates via low-cost mining and vertical integration. The Bayan Obo mine alone produces 70% of global light rare earths.Image
3/12: WHAT'S ACTUALLY RESTRICTED - ELEMENTS & MATERIALS

China added 5 rare earths to the restricted list: holmium (Ho), erbium (Er), thulium (Tm), europium (Eu), and ytterbium (Yb)—critical for lasers, fiber optics, and defense systems.

That means 12 out of 17 rare earths are now restricted, including neodymium (Nd), praseodymium (Pr), and dysprosium (Dy) from April.

Plus dozens of refining and mining equipment items.

Effective: Nov 8 for elements/equipment, Dec 1 full implementation.
4/12: FOREIGN PRODUCTS

Any product with >0.1% Chinese-sourced rare earths needs Beijing's export license for re-export.

Even if it's made in Taiwan. Or Vietnam. Or Texas.

This is China's version of the U.S. Foreign Direct Product Rule. Extraterritorial control over global supply chains.
5/12: MORE CONTROLS

END-USE BANS:
• No licenses for foreign militaries, or weapons
• Case-by-case review for ≤14nm chips, ≥256-layer memory, AI/military R&D

TECHNOLOGY & LABOR:
• Ban on exporting REE mining/processing/recycling tech
• Chinese citizens need government approval to join overseas REE projects

Full compliance deadline: Dec 1, 2025.
6/12: CHINA'S DOMINANCE - THE NUMBERS

Mining: 70% global share (240k tons vs U.S. 43k tons)

But here's where it gets scary:

• 90% of global separation/refining
• 93% of permanent magnet production
• 44M tons reserves (37% global)

Global demand: 200k tons/year, growing 7-10% annually from EVs/AI/renewables.

Alternatives exist (Australia's Lynas 8%, U.S. MP Materials 15%), but they all still send ore to China for processing.Image
7/12: DEFENSE IMPACT

This is where it gets serious.

Rare earths are irreplaceable in military hardware due to magnetic/thermal properties:

• F-35 fighter: 417kg of REEs
• Virginia-class submarine: 4.2 tons
• Tomahawk missiles: REEs in guidance
• Predator drones/JDAMs: precision optics/motors

China refines 100% of global samarium—the element critical for high-temp military magnets.Image
8/12: THE DEFENSE CAPABILITY GAP

The implications are stark:
• China builds military hardware 5-6x faster than the U.S.
• U.S. has zero domestic samarium refining capacity
• Short-term: Stockpiles last months
• Long-term: 5-10 years to build independent supply chains

With Indo-Pacific tensions rising, Beijing now has leverage over the foundation of U.S. defense production.Image
9/12: SEMICONDUCTOR CHOKEPOINT

REEs are critical for chip manufacturing:
• Magnets in lithography equipment (ASML's EUV tools)
• Wafer processing equipment

Ban targets ≤14nm chips (Nvidia A100/H100 territory).

TSMC, Samsung, SK Hynix ALL need licenses if using Chinese REEs.

That 0.1% threshold = de-facto veto power over the semiconductor supply chain.Image
10/12: BROADER ECONOMIC RIPPLES

Markets reacted immediately: Chinese REE stocks surged 9-10%. U.S. miners like MP Materials rose on investment flows.

Short-term: 20-50% price spikes

Key impacts:
• EVs: 30% REE-dependent
• Wind turbines: up to 200kg/MW
• AI data centers: REE magnets for cooling

REE magnet market: $20B (2023) → $30B (2030)

Escalation risk: China controls 80% gallium (LEDs/chips) + 70% lithium refining.

Historical precedent: China's 2010 embargo on Japan sent REE prices up 10x.Image
Image
11/12: U.S. COUNTERMOVES

DoD response:

• $400M equity in MP Materials (largest shareholder)
• $150M loan for heavy REE separation
• 10-year offtake for new magnet facility
• Lynas-Noveon partnership for U.S. production

India/Australia ramping exploration.
Recycling emerging: 10-20% recovery potential from e-waste.

Reality check: 5-10 years minimum to scale. U.S. = <5% global processing today.Image
13/13: THE BOTTOM LINE

China weaponizing 90% processing monopoly to retaliate for U.S. chip bans. Targeting defense (417kg per F-35) and semiconductors ≤14nm.

Short-term: 20-50% price spikes could throttle AI boom (data centers need REE magnets).

Long-term: Forces Western reindustrialization. Diversification takes years.

THE QUESTION: Can alternatives scale faster than China leverages its monopoly?

Negotiations are possible—Trump-Xi could trade chip access ⟷ REE flow.

The decoupling isn't coming. It's here.Image

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More from @AskPerplexity

Oct 6
2025 Nobel Prize in Medicine: The Immune System's Control Mechanism

The 2025 Nobel Prize in Medicine was announced this morning. Three scientists—Mary Brunkow, Fred Ramsdell, and Shimon Sakaguchi won for their groundbreaking discoveries on peripheral immune tolerance, revealing how the immune system prevents self-attacks that lead to autoimmune diseases.

What are T cells? How did scientists uncover immune cells that suppress others? How does this mechanism ward off autoimmune disorders?

Here’s what they found and why it matters:Image
1/ What Are T Cells?

T cells are a type of white blood cell (lymphocyte) central to the adaptive immune system, which learns and remembers specific threats.

They originate in the bone marrow and mature in the thymus gland (hence "T"), where they learn to distinguish the body's own cells ("self") from foreign invaders ("non-self"), such as viruses, bacteria, or cancer cells. This prevents attacks on healthy tissues.

T cells are essential for targeted, long-term immune protectionImage
2/ The Problem

The immune system needs to attack foreign threats like viruses and bacteria. But it must also avoid attacking the body's own healthy cells. When this system fails, you get autoimmune diseases like type 1 diabetes or multiple sclerosis.

For decades, scientists thought immune tolerance worked through one mechanism: in the thymus, dangerous immune cells are eliminated before they enter circulation. This is called central tolerance.Image
Read 11 tweets
Oct 4
Europe has zero companies left in the global top 25. None. Fifteen years ago, eight European titans held spots on that list.

What happened? And what does it actually mean for Europe’s future? Let’s break down one of the most dramatic shifts in global economic power: Image
1/ Europe in 2000

The European companies that were in the global top 8:

Nokia (mobile phones)
Vodafone (telecom)
Royal Dutch Shell (energy)
BP (energy)
Deutsche Telekom (telecom)

Back then, European companies weren’t just competing—they were defining entire industries. Image
2/ Europe Today

Let's look at the current state of play. Of the world's 25 most valuable companies:

United States: 18 companies (72%)
China: 4 companies (16%)
Taiwan: 2 companies (8%)
Saudi Arabia: 1 company (4%)
Europe: Zero (0%)

Apple alone ($3.8T) is worth more than Europe's top 10 companies combined. Microsoft ($3.8T) exceeds Germany's entire DAX index. Nvidia tops everything at $4.5T.

Europe's biggest? ASML at $400B, ranked 27th. Then SAP ($315B), LVMH ($322B), and Novo Nordisk ($263B).

The gap tells the real story.Image
Read 9 tweets
Oct 2
What if I told you that the internet is about to change forever?

We’re launching Comet Plus—fixing how publishers get paid in the AI era.

How it works will change everything:
Comet Plus gives you premium access to trusted publishers—and pays them fairly.

- When you visit their site and read an article? They get paid.

- When we cite their journalism in an AI answer? They get paid.

- When your Comet Assistant uses their content to help you plan your day? They get paid.
80% goes to publishers. We keep 20% for compute costs. That’s it.

The first revenue model built for the AI era. Image
Read 6 tweets
Oct 1
We just figured out how to transfer ONE TRILLION parameters between GPUs in 1.3 seconds.

That’s a 20x speedup over traditional methods.

Let me show you how we did it:
1/ The Problem

When we’re training massive AI models with reinforcement learning, we need two separate GPU clusters working together: training GPUs that update the model, and inference GPUs that run it.

After every training step, we have to copy all those updated weights from training to inference. For our trillion-parameter Kimi-K2 model, most existing systems take 30 seconds to several MINUTES to do this.

That’s a massive bottleneck.

Our training step might take 5 seconds, but then we’d wait 30 seconds just copying weights. Unacceptable.
2/ The Old Way

Traditional systems funnel everything through one “rank-0” GPU. All training GPUs send to one main GPU, which sends to one inference GPU, which distributes to the rest.

It’s like forcing all mail to go through a single post office. That one connection becomes the bottleneck - limited to about 50 gigabytes per second.

We knew there had to be a better way.
Read 7 tweets
Sep 30
The September 2025 White House dinner wasn't what it seemed.

It was America's emergency response to an existential bottleneck: electricity.

AI data centers use 10x more power than traditional servers. Large training runs consume as much electricity as a small city for months—America's grid can't handle it.

Meanwhile, China operates with 80-100% power reserves vs America's 15%. They generate over 10,000 TWh annually (2.3x the US) and added 429 GW of new capacity in 2024 alone—7.7x faster than America.

How bad is this crisis? Full story below:Image
1/ The Real Agenda: "Getting Your Permits"

During the September 2025 White House dinner, the most revealing moment came in President Trump's opening remarks, when he addressed the elephant in the room—electricity access.

"I know everybody at the table indirectly through reading about you and studying, knowing a lot about your business, actually making it very easy for you in terms of electric capacity and getting it for you, getting your permits."

Trump promised to remove the regulatory and infrastructure barriers, and the tech leaders at that dinner table committed $1.5 trillion:

Meta: $600 billion through 2028
Apple: $600 billion
Google: $250 billion over two years
Microsoft: $80 billion annually

But without electricity, those investments are meaningless.Image
2/ America's AI Infrastructure Crisis: The Scale

The transition from traditional computing to AI represents the most significant infrastructure challenge since electrification began.

Traditional Data centers vs. AI Data centers:
- Traditional server racks: 7-10 kW per rack
- AI computing racks: 30-100+ kW per rack — up to 10x more power density
- Individual AI queries consume 10x more electricity than Google searches

Training AI Models:
- Current AI training runs: Up to 1 gigawatt (equivalent to 8 nuclear reactors)
- 2030 projections: 8 gigawatts per training run — exceeding many national grids

The United States is running out of electricity.
Read 9 tweets
Sep 29
US electricity prices are surging at the fastest pace in decades—jumping from 13.66 to 17.02 cents per kilowatt-hour in just four years. That's a 25% increase. The average American household is now paying $219 more annually than in 2021—and it's not just inflation.

Driven by explosive AI demand and a transforming energy market, this crisis could reshape how we power our lives.

Whether you own a home, rent an apartment, or run a business, you're feeling the impact. What's really driving these shocking increases? Let's break it down:Image
THE CRISIS IN NUMBERS

The surge isn't just about dollars—it's about pace.

According to the U.S. Energy Information Administration, electricity prices are rising nearly twice as fast as overall inflation. While the Consumer Price Index increased roughly 13% from 2021 to 2025, electricity jumped 25%.

Your power bill is outpacing your paycheck, and the EIA projects this trend will continue through 2026.

And this is just the beginning.Image
WHERE IT HURTS MOST: REGIONAL PRICE SHOCKS

Now here's where it gets truly shocking.

While the national average has increased 25% since 2021, some states are seeing catastrophic spikes in 2025 alone.

Since 2020, Maine has been crushed with a 67.4% increase—the worst in the nation. California follows at 63.9%, then Connecticut at 55.2%. The entire Northeast corridor is bleeding: Pennsylvania (48.6%), New York (45.1%), and Massachusetts (44.5%) have all seen increases double the national average.

But it's not just coastal elites feeling the pain. Missouri (41.2%), Ohio (40.6%), and Michigan (42.6%) prove the heartland is getting hammered too.

Geography has become destiny when it comes to your electric bill.Image
Read 10 tweets

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