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发布时间: 2025-05-31 04:50:11北京青年报社官方账号
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Schools in the U.K. are removing analog clocks from exam rooms after students complained about not being able to read the time, according to The Telegraph.Malcom Trobe, deputy general secretary at the Association of School and College Leaders, says students are accustomed to using digital devices today."They are used to seeing a digital representation of time on their phone, on their computer," Trobe told The Telegraph. "Nearly everything they've got is digital so youngsters are just exposed to time being given digitally everywhere."Teachers are concerned about students stressing out during exams because they can't keep track of time. One educator said her high schoolers are only able to tell the time on devices with digital displays, which they can't use during exams, according to People.Many teachers turned to Twitter to share their experience and found that issues with analog clocks is a common trend. 935

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SEATTLE (AP) — Seattle's police chief says she will retire. The move was reported Monday, the same day the City Council approved reducing the department through layoffs and attrition. The cuts were supported by demonstrators who have marched in the city following the police killing of George Floyd in Minneapolis. The reductions were strongly opposed by the mayor and police chief. KING-TV reported that Seattle Police Chief Carmen Best, the city's first Black police chief, told the department of her decision in a letter, saying her retirement will be effective Sept. 2. “I am confident the department will make it through these difficult times,” Best said in the letter. “You truly are the best police department in the country, and please trust me when I say, the vast majority of people in Seattle support you and appreciate you. ... I look forward to seeing how this department moves forward through the process of re-envisioning public safety. I relish the work that will be done by all of you.”Budget measures approved Monday would cut less than million of the department’s 0 million annual budget this year. 1131

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SAN MARCOS, Calif. (KGTV) -- The San Diego County Sheriff’s Department is investigating after three people were stabbed in San Marcos Friday night.The department says the stabbing happened on the 300 block of Autumn Drive just before 9 p.m.All three victims were taken to the hospital with non-life threatening injuries, the department said.Although the details surrounding the incident remain unclear, authorities say the suspect is still outstanding. 460

  

SAN FRANCISCO (AP) — San Francisco supervisors moved a step closer Tuesday to becoming the first city in the U.S. to ban all sales of electronic cigarettes to crack down on youth vaping.In a unanimous vote, supervisors approved a ban on the sale and distribution of e-cigarettes. They also endorsed a ban on manufacturing of e-cigarettes on city property. The measures will require a subsequent vote before becoming law."We spent the '90s battling big tobacco, and now we see its new form in e-cigarettes," Supervisor Shamann Walton said.The supervisors acknowledged that the legislation would not entirely prevent youth vaping, but they hoped it would be a start."This is about thinking about the next generation of users and thinking about protecting the overall health and sending a message to the rest of the state and the country: Follow our lead," Supervisor Ahsha Safaí said.City Attorney Dennis Herrera said young people "have almost indiscriminate access to a product that shouldn't even be on the market." Because the Food and Drug Administration has not yet completed a study to assess the public health consequences of e-cigarettes and approved or rejected them, he said, "it's unfortunately falling to states and localities to step into the breach."Most experts agree that e-cigarettes are less harmful than the paper-and-tobacco variety because they do not produce all the cancer-causing byproducts found in cigarette smoke. But researchers say they are only beginning to understand the risks of e-cigarettes, which they think may damage the lungs and blood vessels.Since 2014, e-cigarettes have been the most commonly used tobacco product among young people in the country. Last year, 1 in 5 U.S. high school students reported vaping in the previous month, according to a government survey .FDA spokesman Michael Felberbaum said in a statement that the agency will continue to fight e-cigarette use, including preventing youth access to the products, acting against manufacturers and retailers who illegally market or sell the products to minors and educating young people about health risks.Leading San Francisco-based e-cigarette company Juul frames vaping as a healthier alternative to smoking tobacco. Juul has said it has taken steps to deter children from using its products. The company said in a statement that it has made its online age-verification process more robust and shut down its Instagram and Facebook accounts to try to discourage vaping by those under 21."But the prohibition of vapor products for all adults in San Francisco will not effectively address underage use and will leave cigarettes on shelves as the only choice for adult smokers, even though they kill 40,000 Californians every year," Juul spokesman Ted Kwong said.Tuesday's vote also sets the stage for a November ballot fight over e-cigarettes. Juul has already contributed 0,000 to the Coalition for Reasonable Vaping Regulation, which is set to gather signatures to put an initiative on the issue before voters.The American Vaping Association opposed San Francisco's proposal as well, saying adult smokers deserve access to less hazardous alternatives."Going after youth is a step that you can take before taking these out of the hands of adults," said the association's president, Gregory Conley.Groups representing small businesses also opposed the measures, which they said could force stores to close."We need to enforce the rules that we have in place already," said Carlos Solórzano, CEO of the Hispanic Chamber of Commerce of San Francisco.Walton said he would establish a working group to support small businesses and address their concerns.Although San Francisco's ban is unlike any other in the country, the Public Health Law Center at Mitchell Hamline School of Law reports that all but two states have at least one law restricting youth access to e-cigarettes. City voters last year approved a ban on sales of candy and fruit-flavored tobacco products.Stanton Glantz, a professor of medicine at the University of California San Francisco Center for Tobacco Control and Research and a supporter of the measures, said e-cigarettes are associated with heart attacks, strokes and lung disease.The presence of e-cigarettes, he said, has "completely reversed the progress we've made in youth smoking in the last few years." 4342

  

Scientists are proposing an ingenious but as-yet-unproven way to tackle climate change: spraying sun-dimming chemicals into the Earth's atmosphere.The research by scientists at Harvard and Yale universities, published in the journal Environmental Research Letters, proposes using a technique known as stratospheric aerosol injection, which they say could cut the rate of global warming in half.The technique would involve spraying large amounts of sulfate particles into the Earth's lower stratosphere at altitudes as high as 12 miles. The scientists propose delivering the sulfates with specially designed high-altitude aircraft, balloons or large naval-style guns.Despite the technology being undeveloped and with no existing aircraft suitable for adaptation, the researchers say that "developing a new, purpose-built tanker with substantial payload capabilities would neither be technologically difficult nor prohibitively expensive."They estimate the total cost of launching a hypothetical system in 15 years' time at around .5 billion, with running costs of .25 billion a year over a 15-year period.The report does, however, acknowledge that the technique is purely hypothetical."We make no judgment about the desirability of SAI," the report states. "We simply show that a hypothetical deployment program commencing 15 years hence, while both highly uncertain and ambitious, would indeed be technically possible from an engineering perspective. It would also be remarkably inexpensive."The researchers also acknowledge potential risks: coordination between multiple countries in both hemispheres would be required, and stratospheric aerosol injection techniques could jeopardize crop yields, lead to droughts or cause extreme weather.The proposals also don't address the issue of rising greenhouse gas emissions, which are a leading cause of global warming.And despite the conviction of the report's authors, other experts were skeptical."From the point of view of climate economics, solar radiation management is still a much worse solution than greenhouse gas emissions: more costly and much more risky over the long run," said Philippe Thalmann of the école Polytechnique Fédérale de Lausanne, an expert in the economics of climate change.David Archer of the Department of Geophysical Science at the University of Chicago said, "The problem with engineering climate in this way is that it's only a temporary Band-Aid covering a problem that will persist essentially forever, actually hundreds of thousands of years for fossil fuel CO2 to finally go away naturally."It will be tempting to continue to procrastinate on cleaning up our energy system, but we'd be leaving the planet on a form of life-support. If a future generation failed to pay their climate bill they would get all of our warming all at once." 2830

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