The world's most powerful supercomputer, capable of 2.79 quintillion calculations per second, has been unveiled at Lawrence Livermore National Laboratory in California, designed primarily to maintain the U.S. nuclear weapons stockpile and run other classified simulations. The $600 million system, named El Capitan, consists of 87 computer racks weighing 1.3 million pounds and draws 30 megawatts of power. Built by Hewlett-Packard Enterprise using AMD chips, it operates alongside a smaller system called Tuolumne, which ranks tenth globally in computing power. "While we're still exploring the full role AI will play, there's no doubt that it is going to improve our ability to do research and development that we need," said Bradley Wallin, a deputy director at the laboratory.

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Sales of electric vehicles in Japan fell 33% year-on-year to 59,736 cars in 2024, the first decline in four years, according to data from car dealers and importers compiled by Nikkei on Thursday. From the report: EVs' share of all vehicle sales fell below 2% in Japan, the lowest among major advanced economies. While global EV sales are still growing, albeit more slowly, Japan's reluctance to adopt EVs is becoming increasingly apparent.

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Early life exposure to toxic PFAS "forever chemicals" could impact economic success in adulthood, new first-of-its-kind research [PDF] suggests. From a report: The Iowa State University and US Census Bureau working paper compared the earnings, college graduation rates, and birth weights of two groups of children -- those raised around military installations that had firefighting training areas, and those who lived near bases with no fire training site. The military began using PFAS-laden firefighting foam in the early 1970s, which frequently contaminated the drinking water supplies in and around bases. Those who lived in regions with firefighting training areas earned about 1.7% on average less later in life, and showed a graduation rate about 1% lower. Those born between 1981-1988 earned about $1bn less in today's earnings, or about $1,000 a person on average, compared to those who did not live near the firefighting training sites. The data also shows lower birth weights among the population -- a factor linked to lower economic success later in life. The findings "highlight the importance of careful scrutiny of novel chemicals," said Irene Jacz, a study co-author and Iowa State economist. "We think that there's a causal effect from PFAS here but it's really hard to say, 'Oh it's all brain chemistry, or health effects' so there's a need for more research" Jacz said. The paper is not yet peer-reviewed, but will soon go through the process.

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Three mathematicians have developed a breakthrough method for proving whether numbers can be written as fractions, solving a problem that has puzzled researchers for decades. Frank Calegari, Vesselin Dimitrov and Yunqing Tang proved the irrationality of an infinite collection of numbers related to the Riemann zeta function, building on Roger Apery's landmark 1978 proof about a single such number. The new approach, which relies on 19th-century mathematical techniques, has already helped settle a 50-year-old conjecture about modular forms and could lead to more advances in number theory.

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India's homegrown digital payments ecosystem, anchored by two systems, is challenging Visa and Mastercard's dominance in the world's most populous nation. The backbone is UPI, a nine-year-old bank-to-bank payment network that processes over 13 billion monthly transactions through QR codes and phone numbers, accounting for 71% of all transactions and 36% of consumer spending, according to Bernstein. RuPay, India's domestic card network, has leveraged its exclusive right to process credit card transactions through UPI to double its volume to $7.43 billion in fiscal 2025's first seven months. It now represents 28% of credit card transactions, up from 10% last year. Small merchants are adopting the system as RuPay only charges fees on transactions above $23.3. India's central bank has also mandated banks let customers choose their card network, ending exclusive deals with global providers.

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