临沧妇科炎症如何诊治(临沧闭经前的月经紊乱症状) (今日更新中)

SAN FRANCISCO (AP) — Deadly wildfires in California have burned more than 4 million acres this year, a new record for the number of acres burned in a single year.The previous record was two years ago when wildfires destroyed 1.67 million acres.California fire officials said the state hit the fearsome milestone Sunday with about two months still left in the fire season.More than 16,500 firefighters are working to contain at least 23 major wildfires across the state, officials said.Lightning strikes in mid-August caused some of the most devastating blazes and most of the damage has occurred since then.Since the beginning of the year, more than 8,200 wildfires have ignited, which have incinerated over 8,454 structures and killed 31 people. 754

SAN FRANCISCO (AP) — Pacific Gas & Electric, which is blamed for some of California's deadliest recent fires, knew for years that dozens of its aging power lines posed a wildfire threat but avoided replacing or repairing them, it was reported Wednesday.The Wall Street Journal, using company documents obtained under the federal Freedom of Information Act, reported that the utility told the U.S. Forest Service in 2017 and 2018 that 49 aging steel towers on one transmission line needed replacement and another 57 needed replacement of their hardware and aluminum lines.The Journal previously reported that PG&E delayed safety work on the line, known as the Caribou-Palermo line, for five years.State investigators said an equipment failure on that line sparked a November wildfire that essentially wiped out the Northern California town of Paradise and killed 85 people. It was the deadliest and most destructive in state history.On Wednesday, the Butte County Sheriff's Office identified a previously unnamed victim as 67-year-old Shirley Haley of Paradise.Four other people have been tentatively identified while two bodies remain unidentified.After the fire, PG&E decided to stop using the line, which was built in 1921.PG&E also estimated

SAN FRANCISCO (AP) -- If you haven't been wearing a face mask while taking an Uber, you may be required to take a selfie to prove you are ready to don one the next time you summon a driver on the world's largest ride-hailing service.The mask verification rules rules announced Tuesday expand upon a similar requirement that Uber imposed on drivers in May to help reassure passengers worried about being exposed to the novel coronavirus.The additional safety measures are part of Uber's efforts to rebuild a service that has saw ridership plunge by 56% in the company's most recent quarter. 597

SAN FRANCISCO (AP) — Google announced Wednesday it has achieved a breakthrough in quantum computing, saying it has developed an experimental processor that took just minutes to complete a calculation that would take the world's best supercomputer thousands of years.The feat could open the door someday to machines so blazingly fast that they could revolutionize such tasks as finding new medicines, developing vastly smarter artificial intelligence systems and, most ominously, cracking the encryption that protects some of the world's most closely guarded secrets.Such practical uses are still probably decades away, scientists said. But the latest findings, published in the scientific journal Nature, show that "quantum speedup is achievable in a real-world system and is not precluded by any hidden physical laws," the researchers wrote.RELATED: Google Maps will now allow drivers to report hazards, slowdowns and speed trapsBig tech companies including Microsoft, IBM and Intel are avidly pursuing quantum computing, a new and somewhat bewildering technology for vastly sped-up information processing.While conventional computing relies on bits, or pieces of data that bear either a one or zero, quantum computing employs quantum bits, or qubits, that contain values of one and zero simultaneously.But quantum computing requires placing the fragile and volatile qubits in colder-than-outer-space-refrigerators to control them.Google's quantum processor looks like an upside-down garbage can, out of which comes a series of tubes used to conduct signals to a chip. The whole thing is stored in a cool chamber to protect the chip.RELATED: Google unveils new Pixel 4 smartphone, Pixel BudsGoogle said that its quantum processor, called Sycamore, finished a calculation in 3 minutes, 20 seconds — and that it would take the world's fastest supercomputer 10,000 years to do the same thing.The calculation was a random sampling problem, similar to looking at the various combinations that could come from dice or a gambling machine. It has little practical value, other than to test how well the processor works."The more interesting milestone will be a useful application," said Chris Monroe, a University of Maryland physicist who is also the founder of quantum startup IonQ.Google's findings, however, faced pushback from other industry researchers. A version of Google's paper leaked online last month.IBM took issue with Google's claim that it had achieved "quantum supremacy," or the point when a quantum computer can perform a calculation that a traditional computer can't complete within its lifetime.IBM researchers said that its IBM-developed supercomputer, called Summit, could actually do the calculation in 2.5 days.Google disputed IBM's claims.Whether or not Google achieved "quantum supremacy," the research suggests the field is maturing."The quantum supremacy milestone allegedly achieved by Google is a pivotal step in the quest for practical quantum computers," John Preskill, the Caltech professor who coined the term "quantum supremacy," wrote in a column after the paper was leaked.It means quantum computing research can enter a new stage, he wrote, though a significant effect on society "may still be decades away."One feared outcome — though experts said it is a long way off — is a computer powerful enough to break today's best cryptography.Quantum computers might also one day lead to the development of better artificial intelligence systems to guide financial portfolios, crop yields or transportation routes.The promise of such applications has attracted interest from the U.S., China and other governments. President Donald Trump last year signed a measure to spend more than .2 billion over five years for quantum research across the federal government. 3797

SAN FRANCISCO (AP) — California voters approved a measure Tuesday requiring all eggs sold in the state come from cage-free hens by 2022.Proposition 12 led with 59 percent of the vote with nearly 4 million ballots counted.Supporters say the measure is a step toward more humane farming practices, while opponents say it doesn't go far enough.The measure sets new minimum requirements on the sizes of pens that farmers use to house breeding pigs and calves raised for veal, and it bans sales in California of products from hens, calves and pigs raised in other states that do not meet California's standards.Dubbed the Prevention of Cruelty to Farm Animals Act, Proposition 12 builds on an earlier ballot measure, Proposition 2, that passed in 2008 and banned keeping hens, calves and pigs in tiny cages so cramped they couldn't stand up, lie down or turn around.That measure took effect in 2015 but lacked specific size requirements and did not apply to out-of-state farmers whose products were sold in California.Proposition 12 specifies how much floor space farmers need to give each animal.The measure was sponsored and financed by the Humane Society of the United States, which also backed Proposition 2 and says the upgrade will strengthen the earlier measure and restore California as a leader in the ethical treatment of farm animals.A decade ago, Proposition 2 was the furthest-reaching law for farm animals in the country. Since then a dozen states have banned or restricted confinement for at least one farm animal. Massachusetts passed a comprehensive measure in 2016 that is similar to Proposition 12.The measure had the support of several animal welfare groups, including the American Society for the Prevention of Cruelty to Animals, Sierra Club and Center for Food Safety, and a variety of veterinarians and religious organizations.It requires that, starting in 2020, calves confined for production have at least 43 square feet (4 square meters) of usable floor space, while breeding pigs be given at least 24 square feet (2.2 square meters) of floor space in their pens starting in 2022.RELATED CONTENT 2125

来源：资阳报