Training Data

Two years after its founding, Stark has roughly 700 employees and strike drones in the field in Ukraine. CEO Uwe Horstmann and CTO Johannes Schaback argue that the real lesson of that war is not any single weapon: the innovation ecosystem behind it is the wonder weapon. They explain why Stark designs every system for mass manufacturing from day one, runs 10 to 15 programs like a venture portfolio, and views the staff sergeant who operates a system as just as important as the general who buys it. Johannes recounts the publicly reported failed trial that became a forging moment, as engineers worked around the clock at a freezing test range until they landed three consecutive hits. They discuss NATO’s principles of responsible AI use and the hard-coded constraints in Stark’s autonomy stack. And Uwe lays out his next big idea: defense contracts structured like cloud contracts with surge capacity built in, so production itself becomes deterrence.

Hosted by Pat Grady and Luciana Lixandru, Sequoia Capital

Chapters

0:00 – Introduction

1:03 – Billions in contracts in 18 months: Stark's four-part playbook

2:28 – The staff sergeant matters as much as the general, and wood beats plastic

7:42 – Why Europe is ready for a neo prime, and why procurement reform will last

11:45 – Startup DNA, venture-style programs, and "as complex as a washing machine"

16:27 – Born out of fire: the failed trial and the round-the-clock comeback

21:13 – Where Stark finds talent, and why defense is no longer off-limits

23:48 – Anatomy of a strike, from the wooden crate to the kill zone

27:22 – Vertical integration, multiple domains, and shifting left on manufacturing

32:53 – After the Hugging Face hack: guardrails on autonomous weapons

35:56 – Matching the primes on R&D and scaling to 700 people in two years

39:24 – Deterrence by contract, and Europe's next chapter with the US

Robotics never got the internet's gift of free training data, so someone has to manufacture it. Josh Gao, founder and CEO of Mecka AI, runs one of the largest robot data factories, and he explains what that actually involves: custom baseball caps and tactile gloves because nothing off the shelf captures force, 100-gigabit upload lines to move hundreds of petabytes, and custom quality gates. Josh lays out the training recipe the industry is converging on (roughly a million hours of egocentric human data, tens of thousands of hours of robot data, and a few hours of in-domain teleop ) and why tactile and simulation data still have to enter the "data pot of soup." He argues the field is still orders of magnitude behind Tesla's FSD, which spent a decade on two degrees of freedom while a robot hand has dozens. His take: there won't be a single GPT-3 moment for robotics, but a steady unlock of commercial tasks, starting with constrained industrial work and ending, he hopes, with robots mining asteroids.

Hosted by Sonya Huang, Sequoia Capital

0:00 – Introduction

1:46 – What Mecka is: pixels, actions and logic

2:45 – Is robot data economically feasible without the internet?

4:15 – Teaching robots about carbon life

5:27 – Cloud kitchens, stablecoins and the path to robotics

7:03 – Entering robotics with a fresh lens

8:45 – What egocentric data is and why Mecka bet on it

10:09 – The first pilot: aunties and uncles with a mobile app

10:42 – Force data and tactile gloves

11:55 – Inside the operations of a data factory

14:41 – Heat-mapping the taxonomy of human work

15:42 – Quality gates, fraud and the McDonald’s POV videos

17:44 – Earning a margin as a data intermediary

19:33 – Millions of hours vs. Tesla’s decade

20:55 – Why it isn’t binary: unlocking commercial tasks along the way

22:02 – Home data is plentiful; home robots are the hardest

23:24 – Useful robots can be deployed today

24:35 – When robotics gets an FSD-style flywheel

26:42 – Deployment diffusion and the modern systems integrator

28:21 – Favorite vertical robot categories; mining an asteroid

30:08 – The hardware slate: Waymo-fying people

30:55 – EgoVerse

32:04 – The data pot of soup: the converged training mix

33:54 – Move 37 for robotics: AlphaGo and Federer

36:02 – World models and the training mix

36:58 – Will scaling the current mix get us to the promised land?

39:05 – Will the AGI labs steamroll robotics?

40:50 – Sci-fi roots and the Kawasaki Corleo

42:44 – How many robots in a decade?

David Silver spent two years building AlphaGo on human data. When he removed human data altogether building AlphaGo Zero, the AI surpassed AlphaGo in under two days. He left DeepMind to run that same bet in pursuit of superintelligence. David and Lasse Espeholt, co-founders of Ineffable Intelligence, explain their plan to build a “superlearner”—an agent that starts knowing nothing and discovers science, mathematics, and language for itself by direct experience instead of through a pre-training run. Silver argues that human-language reasoning is a ceiling, not a foundation, that alignment via chain-of-thought monitoring is already reaching its limits, and that the science of how superintelligences coexist should be worked out in simulation before anything touches the real world. Espeholt describes the GPU cluster and the lineage from IMPALA and SEED RL that makes the experiment possible. Silver’s forecast: strong evidence within a year, superintelligence in three.

Hosted by Sonya Huang, Sequoia Capital

0:00 – Introduction

1:09 – What held true from Go to today, and what the LLM era changed

3:35 – Why leave DeepMind to start a new lab

5:58 – Why "Ineffable" (and the secret second reason)

7:03 – Lasse's path: scaling RL at DeepMind and Google Brain

9:31 – Defining a super learner and first contact

12:35 – Super learners vs. LLMs that make discoveries

13:59 – Day to day: the RL stack, crucibles and human-journey milestones

16:13 – Don't breadcrumb the objective: simple rewards, emergent complexity

21:16 – What a crucible looks like

24:14 – Go: one agent is boring, two is infinite

25:41 – Will agents rediscover language?

27:22 – Removing human priors: AlphaGo to AlphaZero

32:05 – Keeping human bias out of the crucibles

33:35 – Confidence, timing and super forecasting

36:24 – Is compute the driver?

38:13 – The ceiling on simulation and Rich Sutton's objection

43:44 – Alignment and the science of superintelligence

47:45 – Monitoring agents that don't think in English

51:01 – Pacing the frontier

52:54 – The compute setup: Vera Rubin on GCP

55:18 – Training, inference, simulation and RL scaling laws

57:40 – IMPALA and SEED RL

1:00:58 – 20 people and the compute-per-person ratio

1:04:49 – A research-led culture

1:05:47 – Predictions

At 100,000-accelerator scale, something fails multiple times an hour, which is why Google's Chief Technologist for AI Infrastructure Amin Vahdat thinks FLOPS is a vanity metric. The metric that matters is what he calls goodput: the useful work a workload actually delivers through real failures. Amin walks through the calculus that split the TPU line into 8i and 8t for the first time, why the TPU's core primitives haven't changed since v1, and how Google and DeepMind co-design in the same rooms, intercepting chip architectures mid-flight before tape-out. He explains why long-horizon agents are sending demand for CPUs and storage through the roof alongside accelerators, how optical circuit switches reroute light to a spare rack in milliseconds, and why Google would rather wait on a utility than build its own gigawatt. We also cover orbital data centers and the multi-megawatt rack of 2036.

Hosted by Sonya Huang, Sequoia Capital

0:00 – Introduction

1:47 – What makes a data center an AI data center

5:30 – Goodput, not FLOPS: holding yourself accountable when something fails every hour

11:52 – Doubling token capacity every six months, and where the gains actually come from

15:32 – The TPU bet: from a contrarian call in 2013 to splitting 8i and 8t

23:30 – The case for and against co-design

26:11 – Shoulder to shoulder with DeepMind: intercepting chips mid-flight

34:16 – Long-horizon agents change the shape of the data center

37:50 – Optical circuit switching and the state of networking

42:35 – Power is the binding constraint: utilities, gigawatts, and sizing a data center

49:23 – Training vs. serving clusters, seven-year-old TPUs, and open standards

58:29 – Orbital data centers and the supercomputer of 2036

Starting a company is hard. Reinventing your company for AI as a public company with quarterly earnings results is even harder. Aaron Levie has pulled off the transition with Box and offers hard-won advice for founders. The cofounder and CEO of Box argues the value isn't only in the model; it's in the bridge from a model's raw capability to the actual workflow inside a bank, a law firm, or a pharma company. That's the case for the application layer, and Box is building it: an agent harness tuned so tightly to its own file system, permissions, and search that it beats handing the raw API to Claude or ChatGPT on both accuracy and latency. Aaron explains why token subsidies from the labs can't last, why you want a model-agnostic company routing your tokens rather than the one selling them, and why coding diffused fast while the rest of knowledge work won't. (There's no "give us your GitHub" for a sales rep.) His prediction: within five years, 90% of enterprise tokens go to work no human user ever initiated.

Hosted by Sonya Huang, Sequoia Capital

0:00 – Introduction

1:55 – Are application companies the hottest neolabs?

6:56 – Will the labs move up the stack?

12:34 – Box and betting the company on AI

16:50 – Hero use cases: reading a million contracts and long-running agents

18:42 – Work slop: why AI code is embraced but AI content isn't

24:08 – Building Box's agentic harness and the evals that matter

27:23 – The state of the model race

29:25 – Open-weight model adoption in the enterprise

32:34 – Memory, continual learning, and what belongs in the weights

37:29 – Box Labs and systems of record in a world of agents

44:55 – Will chat be the dominant UI for enterprise AI?

48:00 – Why coding diffused fast and the rest of knowledge work hasn't

54:31 – Staying wired in, making a company AI-first, and what it takes to win

Most public safety technology companies grow by collecting more data. Peregrine inverted the model: no sensors, no new data, a business built on connecting the data and information cities already own. Co-founders Nick Noone and Ben Rudolph received more than two dozen no's before San Pablo PD let them in the door in February 2018. Today, Peregrine powers law enforcement, emergency medical services, fire and rescue, and other services in more than 400 cities and communities globally. Nick and Ben explain their north star for data sovereignty, and discuss how Peregrine's philosophy and privacy-first approach to data access and ownership preserves individual privacy and cities' sovereignty. They walk through how AI and long-horizon agents are being deployed: a cold case agent that reproduced an exoneration detectives had reached by hand, a Wisconsin county that placed a suspect using cell records buried in 300GB of evidence, identifying threats to a synagogue, root-causing an escalation in weather-related incidents, and more.

00:00 Introduction

02:07 What Forward Deployed Engineering Means

03:58 What Silicon Valley Gets Wrong

05:23 UNHCR, Dimagi And Downstream Data Problems

08:25 Why Cities, Why Safety

10:45 Two Dozen Nos And San Pablo PD

14:19 Building Through Defund The Police

18:16 The Inversion Of The Collection Model

21:20 Data Ownership And Governance

22:57 From Nice Search To Deep Analysis

29:59 Agents Writing The Integrations

31:45 The Cold Case Agent

35:02 The Anti-Network-Effect Proposition

38:40 Facial Recognition And Hard Decisions

40:48 Technology For The Underdogs

42:54 Trusting The Individual Contributor

48:50 Ten Thousand Cities

Parag Agrawal is making a bet that goes against two decades of web search: agents will query the web a thousand times more than humans ever have, and the infrastructure built around human clicks is wrong for them. The former Twitter CEO, now founder and CEO of Parallel Web Systems, explains why Parallel treats human click data as a bug and trains on agent feedback instead. He unpacks the counterintuitive choice to ship a search agent before a search engine, building an index incrementally, and how the new Turbo product cut agentic search to 200 milliseconds. But the problem Parag keeps returning to is economic: the ad-supported internet collapses when agents show up instead of people. His fix draws on Shapley values to pay content owners for the value their pages provide agents, with real dollars reaching publishers, he predicts, within 12 to 24 months.

Hosted by Sonya Huang and Andrew Reed, Sequoia Capital

00:00 Introduction 03:25 What Is Web Search 05:17 Why Start a New Index 07:52 Search Agents First 10:17 Not a Neolab 13:14 Agents vs Google Search 19:38 Inside the Search Stack 28:59 Search Multipliers With Agents 30:21 Meeting Prep Agent Workflows 31:46 Quality Cost Latency And Turbo 32:42 Are Agents Overtaking Humans 34:28 Ads Model Meets Agent Web 37:20 New Incentives For Content 40:48 Shapley Values Attribution 47:46 Parallel Web And Future Vision

Rich Sutton, who helped pioneer reinforcement learning and wrote the seminal AI essay The Bitter Lesson, has now cofounded Oak Lab with his former student Khurram Javed. Their goal: to build agents that continuously learn from their own experience rather than from us. Rich doesn't think he holds a radical view: "I'm not weird. The field is weird." He says all learning is continual, and the field is the one that needed a new name for it. Rich and Khurram argue synthetic data is "a big mistake." Their "big world hypothesis" is that the world is massively more complex than any agent or simulator, so approximations have to be updated continuously rather than frozen at deployment. Rich calls LLMs an unanticipated scientific breakthrough, but says they represent roughly a quarter of intelligence. He says catastrophic forgetting is "totally curable" with the ideas behind their continual backprop algorithm. Khurram explains why the frontier labs can't follow: they sit in a local minimum where a new paradigm gets worse before it gets better. Their target, five to ten years out, is a trillion-parameter mind that keeps learning, stays coherent, and runs on 20 watts.

Hosted by Sonya Huang and Alfred Lin, Sequoia Capital

00:00 Introduction 02:10 An AI winter, a cancer diagnosis, and the move to Alberta 07:07 Writing "The Bitter Lesson," and what people get wrong 09:53 Are LLMs a positive or a negative example of it? 11:03 Synthetic data is "just a big mistake," and the Big World Hypothesis 18:01 AlphaGo, human priors, and why prior knowledge and learning should be friends 22:37 "Their weights never change": do LLM assistants actually learn? 26:09 Babies, squirrels, and why no animal learns by supervised learning 32:02 Rockets, imagination, and where paradigm shifts come from 36:42 The Alberta Plan and its 12 steps 38:53 Catastrophic forgetting and the cure 43:43 Oak's biggest ambition: a self-maintaining mind 47:56 Why the big labs are stuck in a local minimum 49:13 If everything goes right: LLMs, many minds, and hiring

Most people treat biology as a bespoke, messy science. Josh Meier and Matt McPartlon, co-founders of Chai Discovery, treat it as an engineering problem. They make the case that drug design obeys the bitter lesson: scale data, models, and compute, and the model can learn what a hand-built pipeline simply couldn't capture. The results are concrete: Chai-2 pushed de novo antibody design from a sub 0.1% hit rate to 16%, turning a needle-in-a-haystack search into something more like designing a key to fit a lock. Josh argues, counterintuitively, that biology is more verifiable than code, and explains why the goal should be more lab experiments, not fewer. Their bet: a design suite that collapses drug discovery from nine months to nine days, and arms the pharma industry rather than competing with it.

Hosted by Pat Grady and Sonali Singh, Sequoia Capital

00:00 Introduction 01:52 From Discovery to Design 03:25 Protein AI Breakthroughs Timeline 06:04 Why Start in 2024 10:13 Diffusion Models Intuition 11:41 Building the Avengers Team 15:22 Hit Rates and Scaling Laws 25:01 Molecular CAD Vision 25:24 Faster Design Loops 26:32 Future Drug Discovery 28:37 Platform Business Model 31:14 Partnering Reality Check 33:44 Data Flywheel Explained 37:16 Staying Ahead at Scale 39:44 Culture and What's Next

Jerry Tworek led reasoning at OpenAI, convinced that scaling reinforcement learning was the path to AGI. Rohan Anil co-led Gemini pre-training and built the Shampoo optimizer. Now they've teamed up at Core Automation on a contrarian premise: the transformer has carried us as far as it can, and the bottleneck to smarter systems is no longer scale — it's the architecture itself. The missing capability is continual learning, models that adapt at test time, which transformers can't do. In-context learning taps out fast (Codex needs compacting after ~20 minutes) and fine-tuning invites catastrophic forgetting. Rohan argues pre-training and RL should be optimized end-to-end, and that transformers spend computation inefficiently. They lay out why the largest labs won't chase alternatives while locked in the coding-agent race, and why building the world's most automated lab starts with automating kernel generation—the one place frontier models still lose to a high-taste human.

Hosted by Sonya Huang and Pat Grady, Sequoia Capital

Factory started building fully autonomous coding agents in April 2023, two years before enterprises were ready. Matan Grinberg now says this is indistinguishable from being wrong. The Factory co-founder and CEO explains how the company survived its "journey in the desert," including the decision to hand nearly all of its revenue back to customers when the product wasn't making developers obsessed. Matan makes the contrarian technical case that a model-agnostic harness beats the model-and-harness co-design that labs like OpenAI and Anthropic favor, because exposing a harness to many models keeps it from overfitting to any single one. He argues open-weight models like GLM will capture the majority of tokens by staying one generation behind the frontier at a fraction of the cost, and that CIOs will soon justify every incremental token the way they justify headcount. Looking ahead, he predicts 90% of coding tokens will run asynchronously—the "dark factory" where software builds itself.

Hosted by Sonya Huang and Pat Grady, Sequoia Capital

Katelyn Lesse and Angela Jiang lead the team building Anthropic's developer platform - the layer that both outside builders and Anthropic's own products run on top of. Angela frames the platform as a three-layer stack: knowledge, execution, and coordination. She argues the real leverage is what’s at the top: "strategies," or meta-harnesses that give each token a different job, from advising to executing to reflecting to memory. On the question of open ecosystem vs. walled garden, they say they aren't precious about owning the stack. Katelyn points to Anthropic's self-hosted sandboxes with partners like Modal, Vercel, and Cloudflare. Whether the work runs on Anthropic's infrastructure or someone else's, what really matters to them is that the architecture is sound. The deeper bet is standards: they hand skills and MCP to the whole industry, build connectors on the MCP spec, and help agents (Claude and non-Claude) work together. The one place they stay closed is model routing: they argue harnesses should be tuned to a model family, so they're designing for Claude rather than routing across models. Angela's frame for the ecosystem bet is electricity: transformative only because everyone could plug in, and no company wired it alone.
Hosted by Sonya Huang and Lauren Reeder, Sequoia Capital

00:00 Introduction

01:49 Two North Stars

02:27 External Builders And Primitives

03:54 What To Externalize

06:00 From Messages To Agents

08:19 Managed Agents Adoption

09:07 Three Layer Cake

10:22 Execution Harnesses Explained

11:09 Coordination Strategies Roadmap

12:13 Ecosystem Standards And Safety

15:39 Open Ecosystem Not Walled

17:12 Vertical Products And Form Factors

22:26 Claude Tag Under The Hood

26:04 Harness Best Practices

38:13 Token Costs And Whats Next

The largest commercial autonomous system on earth isn't a robotaxi fleet — it's Zipline, which has flown 140 million autonomous miles with zero safety incidents. Co-founder Keller Rinaudo Cliffton and Eric Watson, who leads systems engineering and safety, explain why the drone itself is only 15% of the solution. The rest spans inventory management, air traffic integration, and engineering systems such as a dual flight computer failover protocol that recently saved a delivery mid-flight. They trace Zipline's path from launching blood delivery in Rwanda in 2016 (when drone delivery was illegal in the US) to a 51% reduction in maternal mortality in that country, a $550 million commercial diplomacy partnership with the State Department, and a cost curve that fell from $300 per delivery to $12. Zipline is now racing toward a million deliveries a day, and a quiet inflection point when autonomous delivery becomes cheaper than sending a car.

Hosted by Alfred Lin and Pat Grady, Sequoia Capital

Dylan Patel, founder of SemiAnalysis, argues the biggest gains in AI don't come from faster chips, they come from software-hardware co-design. Optimizing the model, the kernels, and the silicon together turns a 2x here and a 2x there into 100x. He explains why DeepSeek's experts were shaped for Nvidia's Hopper (and why TPUs struggle to run it), why OpenAI's sparser models and Anthropic's denser ones pull them toward different hardware, and why the so-called CUDA moat was never really about CUDA. Dylan breaks down InferenceX, his living benchmark that runs the latest models on over $50M of donated hardware daily, tracking a roughly 60x annual drop in cost per unit of quality. He makes the case that inference will be a bigger market than oil, that the compute crunch persists because models expand the value of useful work faster than compute grows, and why Jensen Huang is bankrolling neoclouds to engineer a multipolar world.

Hosted by Shaun Maguire and Sonya Huang, Sequoia Capital

Dan Biderman and Jessy Lin, co-founders of Engram, are building a neolab around memory and continual learning, which they call two sides of the same coin. Their contrarian premise: instead of stuffing ever-larger prompts into the context window or bolting on RAG, bake a team's knowledge directly into the model's weights, so it knows your company the way an employee of several years does.

The payoff: matching or beating frontier models while consuming up to 100x fewer tokens. Working with partners like Microsoft, Notion, and Harvey, the team draws on roots in computational neuroscience and state-space architectures to attack what they see as the real bottleneck in AI — not raw intelligence, but memory and continual learning. In contrast to the frontier labs' race toward one ever-bigger model and AGI, Dan and Jessy imagine a world where everyone has their own model — privately trained, always learning, and good at the things you actually care about. The real ChatGPT moment for memory, they argue, is the day your model feels like an intern that genuinely got smarter overnight.

Hosted by Sonya Huang and Shaun Maguire, Sequoia Capital

The race to build superintelligence is producing models that keep getting better at objective problems, but not at behaving like actual people. Joon Sung Park, founder and CEO of Simile and creator of Stanford's "Smallville" generative agents study, argues that simulating human society requires a fundamentally different kind of model. He frames today's frontier models as the "CPU of intelligence"—rational, superhuman at problems with right answers—and Simile as creating the "GPU of intelligence," built to encode the diversity of people's values, preferences, and tastes. It simulated 1,000 Americans and predicted their behavior 85% as accurately as people reproduce their own answers. CVS uses it for concept testing; some customers simulate their own earnings calls. Joon's larger bet: a "CERN of human society" that could one day model bank runs, climate cooperation, or the early signals of a collapsing democracy.

Hosted by Sonya Huang, Sequoia Capital

The entire startup ecosystem is racing to build agent harnesses. Logan Kilpatrick, who leads Google AI Studio and the Gemini API, argues that scramble has a roughly 12-month shelf life. Models will absorb the scaffolding and run it natively, so the edge moves elsewhere. Google's own bet runs in parallel: a single agent harness, born from the Windsurf team and now called Antigravity, has become the connective tissue across search, the Gemini app, Cloud, and AI Studio — the role Gemini-the-model used to play. Logan makes the case that coding already feels like narrow superintelligence, and that "jagged" vertical superintelligence (in math, finance, and science) will arrive well before AGI. He argues Google's real goal is maximizing outcomes for users, not eyeball time. He unpacks Omni, the single model built to replace multiple separate systems Google once trained for text, audio, music, image, and video. His throughline: AI is an accelerant for human ambition, not a substitute for it.

Hosted by Sonya Huang, Sequoia Capital

Jensen Huang, founder and CEO of NVIDIA, makes the case that computing is undergoing its biggest shift in 60 years: from retrieval, where data centers store files we look up, to generation, where every word, image, and video is produced in real time and customized for whoever is asking. He explains why NVIDIA's AI factories are the dynamos of this era: machines that take in electrons and send out tokens of intelligence, just as Siemens' dynamo once turned motion into electricity. Jensen frames intelligence as the third force to "cocoon" the planet after electricity and the internet. He describes the five-layer cake of AI investment—energy, chips, infrastructure, models, applications—and dismantles the fear that AI will erase jobs, using radiology and software engineering to show how automation raised labor demand instead of killing it. His bottom line: you won't lose your job to AI, but you might lose it to someone who uses AI.

Hosted by Konstantine Buhler, Sequoia Capital

Alfred Wahlforss, co-founder and CEO of Listen Labs, is building an AI agent that interviews your customers at a scale no focus group ever could—thousands of voice conversations at once, drawn from an audience of 30 million people. A year after launch, Listen serves hundreds of Fortune 100s to Startups including Microsoft, Google, NBC Universal, P&G, Anthropic, Cursor, and Cognition. Alfred explains the counterintuitive finding underneath it all: people are often more honest with an AI than a human interviewer, opening up to a non-judgmental entity that costs less and never makes them feel rushed. He walks through why interview transcripts—not credit card data or behavioral logs—turn out to be the richest fuel for predicting how customers will behave, how Listen back-tests its simulations to know which questions it can and can't answer, and why 80% of the company's engineering goes into building the right audience. As AGI makes building trivial, Alfred argues the scarce resource becomes knowing what to build. That's the loop Listen wants to own.

Cursor's Federico Cassano and Fireworks' Dmytro Dzhulgakov explain how they collaborated to build Composer as a specialized foundation model. The core insight: models have finite capacity in their weights, and allocating all those bits to the singular task of software engineering in Cursor frees the model to be both better at the task and far more efficient at inference. Rather than start from pre-training and work up, they took an unconventional top-down approach — mid-training and RL on top of an open-source base to get a useful model into users' hands fast, then specializing the model around real Cursor usage. With Fireworks providing distributed infrastructure, Composer delivers frontier-class coding performance with the speed of a much smaller model.

Hosted by Sonya Huang, Sequoia Capital