Engineers at the University of California, Davis, have invented a device that can generate mechanical power at night by linking the natural warmth around us to the cold depths of space. The invention could be used, for example, to ventilate greenhouses or other buildings. The work is described Nov. 12 in Science Advances.

The invention is a type of machine called a Stirling engine. Other machines such as internal combustion engines generate power from a large heat gradient, said Jeremy Munday, professor of electrical and computer engineering at UC Davis and co-author on the paper. In contrast, a Stirling engine can work based on a small difference in temperature, such as that between a hot cup of coffee and its surroundings.

“These engines are very efficient when only small temperature differences exist, whereas other types of engines work better with larger temperature differences and can produce more power,” Munday said.

Typically, a Stirling engine is directly connected to a heat source on one side and a cooler environment on the other side.

“If you just set it on the table, it’s not going to produce any power on its own because all sides are the same temperature,” Munday said.

One way to generate a temperature difference, of course, is to heat up one side by burning fuel. Munday and graduate student researcher Tristan Deppe wondered if instead they could connect the cold side to something very, very cold but also very far away: deep space.

“It doesn’t actually have to touch space physically, it can just interact radiatively with space,” Munday said. It’s like standing outside on a cold, clear night: Your head will quickly start to feel cold as heat radiates away.

Deppe and Munday’s idea was to take a simple Stirling engine (essentially a piston driving a flywheel), put it on a panel that acts as a heat-radiating antenna and sit the whole thing on the ground outdoors at night. The ground acts as the warm side of the engine and the antenna channels the cold of space.

A year of night time experiments shows that the small device can indeed generate at least 400 milliwatts of mechanical power per square meter. The researchers used the device experimentally to directly power a fan and also coupled it to a small electrical motor to generate current.

The experiments show that it is possible to generate useful amounts of power from the night sky. The potential is greatest in areas where humidity is low and night skies are usually clear, Munday said. The principle could be used, for example, to ventilate greenhouses or residential buildings.

UC Davis has filed a provisional patent related to the work.

As more robots start showing up in warehouses, offices, and even people’s homes, the idea of large language models hacking into complex systems sounds like the stuff of sci-fi nightmares. So, naturally, Anthropic researchers were eager to see what would happen if Claude tried taking control of a robot—in this case, a robot dog.

In a new study, Anthropic researchers found that Claude was able to automate much of the work involved in programming a robot and getting it to do physical tasks. On one level, their findings show the agentic coding abilities of modern AI models. On another, they hint at how these systems may start to extend into the physical realm as models master more aspects of coding and get better at interacting with software—and physical objects as well.

“We have the suspicion that the next step for AI models is to start reaching out into the world and affecting the world more broadly,” Logan Graham, a member of Anthropic’s red team, which studies models for potential risks, tells WIRED. “This will really require models to interface more with robots.”

Anthropic was founded in 2021 by former OpenAI staffers who believed that AI might become problematic—even dangerous—as it advances. Today’s models are not smart enough to take full control of a robot, Graham says, but future models might be. He says that studying how people leverage LLMs to program robots could help the industry prepare for the idea of “models eventually self-embodying,” referring to the idea that AI may someday operate physical systems.

It is still unclear why an AI model would decide to take control of a robot—let alone do something malevolent with it. But speculating about the worst-case scenario is part of Anthropic’s brand, and it helps position the company as a key player in the responsible AI movement.

In the experiment, dubbed Project Fetch, Anthropic asked two groups of researchers without previous robotics experience to take control of a robot dog, the Unitree Go2 quadruped, and program it to do specific activities. The teams were given access to a controller, then asked to complete increasingly complex tasks. One group was using Claude’s coding model—the other was writing code without AI assistance. The group using Claude was able to complete some—though not all—tasks faster than the human-only programming group. For example, it was able to get the robot to walk around and find a beach ball, something that the human-only group could not figure out.

Anthropic also studied the collaboration dynamics in both teams by recording and analyzing their interactions. They found that the group without access to Claude exhibited more negative sentiments and confusion. This might be because Claude made it quicker to connect to the robot and coded an easier-to-use interface.

The Go2 robot used in Anthropic’s experiments costs $16,900—relatively cheap, by robot standards. It is typically deployed in industries like construction and manufacturing to perform remote inspections and security patrols. The robot is able to walk autonomously but generally relies on high-level software commands or a person operating a controller. Go2 is made by Unitree, which is based in Hangzhou, China. Its AI systems are currently the most popular on the market, according to a recent report by SemiAnalysis.

The large language models that power ChatGPT and other clever chatbots typically generate text or images in response to a prompt. More recently, these systems have become adept at generating code and operating software—turning them into agents rather than just text-generators.

The new era of Silicon Valley runs on networking—and not the kind you find on LinkedIn.

As the tech industry funnels billions into AI data centers, chip makers both big and small are ramping up innovation around the technology that connects chips to other chips, and server racks to other server racks.

Networking technology has been around since the dawn of the computer, critically connecting mainframes so they can share data. In the world of semiconductors, networking plays a part at almost every level of the stack—from the interconnect between transistors on the chip itself, to the external connections made between boxes or racks of chips.

Chip giants like Nvidia, Broadcom, and Marvell already have well-established networking bona fides. But in the AI boom, some companies are seeking new networking approaches that help them speed up the massive amounts of digital information flowing through data centers. This is where deep-tech startups like Lightmatter, Celestial AI, and PsiQuantum, which use optical technology to accelerate high-speed computing, come in.

Optical technology, or photonics, is having a coming-of-age moment. The technology was considered “lame, expensive, and marginally useful,” for 25 years until the AI boom reignited interest in it, according to PsiQuantum cofounder and chief scientific officer Pete Shadbolt. (Shadbolt appeared on a panel last week that WIRED cohosted.)

Some venture capitalists and institutional investors, hoping to catch the next wave of chip innovation or at least find a suitable acquisition target, are funneling billions into startups like these that have found new ways to speed up data throughput. They believe that traditional interconnect technology, which relies on electrons, simply can’t keep pace with the growing need for high-bandwidth AI workloads.

“If you look back historically, networking was really boring to cover, because it was switching packets of bits,” says Ben Bajarin, a longtime tech analyst who serves as CEO of the research firm Creative Strategies. “Now, because of AI, it’s having to move fairly robust workloads, and that’s why you’re seeing innovation around speed.”

Big Chip Energy

Bajarin and others give credit to Nvidia for being prescient about the importance of networking when it made two key acquisitions in the technology years ago. In 2020, Nvidia spent nearly $7 billion to acquire the Israeli firm Mellanox Technologies, which makes high-speed networking solutions for servers and data centers. Shortly after, Nvidia purchased Cumulus Networks, to power its Linux-based software system for computer networking. This was a turning point for Nvidia, which rightly wagered that the GPU and its parallel-computing capabilities would become much more powerful when clustered with other GPUs and put in data centers.

While Nvidia dominates in vertically-integrated GPU stacks, Broadcom has become a key player in custom chip accelerators and high-speed networking technology. The $1.7 trillion company works closely with Google, Meta, and more recently, OpenAI, on chips for data centers. It’s also at the forefront of silicon photonics. And last month, Reuters reported that Broadcom is readying a new networking chip called Thor Ultra, designed to provide a “critical link between an AI system and the rest of the data center.”

On its earnings call last week, semiconductor design giant ARM announced plans to acquire the networking company DreamBig for $265 million. DreamBig makes AI chiplets—small, modular circuits designed to be packaged together in larger chip systems—in partnership with Samsung. The startup has “interesting intellectual property … which [is] very key for scale-up and scale-out networking” said ARM CEO Rene Haas on the earnings call. (This means connecting components and sending data up and down a single chip cluster, as well as connecting racks of chips with other racks.)

Light On

Lightmatter CEO Nick Harris has pointed out that the amount of computing power that AI requires now doubles every three months—much faster than Moore’s Law dictates. Computer chips are getting bigger and bigger. “Whenever you’re at the state of the art of the biggest chips you can build, all performance after that comes from linking the chips together,” Harris says.

His company’s approach is cutting-edge and doesn’t rely on traditional networking technology. Lightmatter builds silicon photonics that link chips together. It claims to make the world’s fastest photonic engine for AI chips, essentially a 3D stack of silicon connected by light-based interconnect technology. The startup has raised more than $500 million over the past two years from investors like GV and T. Rowe Price. Last year, its valuation reached $4.4 billion.