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Air conditioning is something you barely notice — until the power goes out, and it no longer works. But what if keeping cool didn’t require electricity at all?

A scientist has invented a material that reflects the sun’s rays off rooftops, and even absorbs heat from homes and buildings and radiates it away. And — get this — it is made from recyclable paper. The essential AC: Air conditioners are in 87% of homes in the United States, costing the homeowner $265 per year, on average. Some homes can easily spend twice that.

With global temperatures on the rise, no one is giving up their AC. More people are installing air conditioners than ever before, especially in developing countries where the middle class can finally afford them. 15 years ago, very few people in China’s urban regions had air conditioners; now, there are more AC units in China than there are homes.

Scientists can now “decode” people’s thoughts without even touching their heads, The Scientist reported.

Past mind-reading techniques relied on implanting electrodes deep in peoples’ brains. The new method, described in a report posted 29 Sept. to the preprint database bioRxiv, instead relies on a noninvasive brain scanning technique called functional magnetic resonance imaging (fMRI).

FMRI tracks the flow of oxygenated blood through the brain, and because active brain cells need more energy and oxygen, this information provides an indirect measure of brain activity.

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Recent years have seen a growing demand for artificial intelligence (AI) acceleration hardware. IBM has taken note.

In the earliest days of AI, commercial CPU and GPU technologies were enough to handle the technology’s data sizes and computational parameters. But with the emergence of larger datasets and deep learning models, there is now a clear need for purpose-built AI hardware acceleration.

Researchers in Europe have developed an efficient way to deliver internet speeds at over 1 million gigabits per second through a single chip and laser system.

The experiment achieved a speed of 1.8 petabits per second, or nearly twice the amount of internet traffic the world transmits at the same rate. Amazingly, the feat was pulled off using only a single optical light source.

The research comes from a team at Technical University of Denmark and Chalmers University of Technology in Sweden. Last week, the group published a peer-reviewed paper (Opens in a new window) in Nature Photonics about the technology.