济南前列腺炎表现的症状(济南前列腺穿刺活检费用) (今日更新中)

Math enthusiasts know all about it, and the rest of the population is probably hoping for cherry pie.But March 14 is Pi Day. While last year stretched the symbolic celebration out a little longer -- to 3.1415 -- each year presents ample opportunity for learning.To 31 decimal places, the celebrated irrational number that never ends is 3.1415926535897932384626433832795.A few more tidbits about pi and Pi Day:About piPi is the ratio of the circumference of a circle to its diameter. It's not equal to the ratio of any two whole numbers, so an approximation -- 22/7 -- is used in many calculations.Pi is essential in architecture and construction and was used frequently by early astronomers. Pi has been known for about 4,000 years, but it started to be called by the Greek letter only in the 1700s.The origin of Pi DayPi Day started 30 years ago at San Francisco's Exploratorium.Physicist Larry Shaw, who worked in the electronics group at the museum, started celebrating pi on March 14, 1988, primarily with museum staffers. The tradition has grown to embrace math enthusiasts from all walks of life.For more about pi, visit www.piday.org. 1159

MEXICO CITY (AP) — President Andres Manuel Lopez Obrador launched an ambitious plan Saturday to stimulate economic activity on the Mexican side of the U.S.-Mexico border, reinforcing his country's commitment to manufacturing and trade despite recent U.S. threats to close the border entirely.Mexico will slash income and corporate taxes to 20 percent from 30 percent for 43 municipalities in six states just south of the U.S., while halving to 8 percent the value-added tax in the region. Business leaders and union representatives have also agreed to double the minimum wage along the border, to 176.2 pesos a day, the equivalent of .07 at current exchange rates.Lopez Obrador, who took office on Dec. 1, said the idea is to stoke wage and job growth via fiscal incentives and productivity gains. U.S. President Donald Trump has repeatedly complained that low wages in Mexico lure jobs from the U.S. Mexico committed to boost wages during last year's negotiations to retool its free trade agreement with the U.S. and Canada.Speaking from Ciudad Juarez, a manufacturing hub south of El Paso, Texas, Lopez Obrador said Saturday he agrees with Trump that Mexican wages "should improve." He decried, for instance, that Mexican auto workers earn a fraction of what their U.S. counterparts take home, topping out at just an hour versus a typical wage of an hour in the U.S.Yet the economic plan comes at a delicate moment for the border region. Trump threatened as recently as last week to close the U.S.-Mexico border "entirely" if Democrats refuse to allot .6 billion to expand the wall that separates the two countries.Economy Minister Graciela Marquez noted Saturday that the border region targeted for economic stimulus accounts for 7.5 percent of Mexico's gross domestic product. And in recent years, she said, the 43 municipalities included in the plan have boasted combined economic growth of 3.1 percent, above the national average of 2.6 percent for the six years through 2017.Much of that robustness owes to trade and proximity with the U.S., the world's biggest economy."We have to take advantage of this locomotive that we have on the other side of the border," she said.Marquez expressed optimism that the stimulus plan will direct more Mexican and foreign investment into the border region. The plan for the border region is part of what Lopez Obrador calls "curtains of development" to shore up different corridors of the country so that Mexicans stay rather than migrating in search of better economic prospects. 2543

MCALLEN, Texas (AP) — Authorities say two police officers were shot and killed Saturday by a suspect who later fatally shot himself in a South Texas border town after responding to a domestic disturbance call. McAllen Police Chief Victor Rodriguez identified the slain officers as 45-year-old Edelmiro Garza and 39-year-old Ismael Chavez. Garza was an officer with the police department for more than eight years while Chavez had over two years of experience. Police say the officers first met with two people who reported assaults that took place inside a nearby home on the south side of the city. The alleged shooter, whom police identified as 23-year-old Audon Ignacio Camarillo, opened fire when officers attempted to enter the home. 746

Max Booth is from Redondo Beach and was excited to go to Maine for a summer camp for the second year. This year, that didn’t happen because of coronavirus, leaving Max at home. Then, his grandparents stepped in to save the day.Tim and Joy Booth live in Pacific Beach and said right around when Max found out he would be staying home for the summer, beaches and public places in their area started opening up, so they took advantage and planned a substitute summer camp for the 10-year-old.“It gave us real happiness to figure out how to make something that was at least a little bit similar to what he might have had,” said Joy.The trio spent the last week exploring the San Diego area, completing a long list of activities like cutting wood and barbecuing at a park, going to the beach, playing at a water park, practicing archery, hiking and observing nature, completing a junior park ranger program at the Cabrillo Monument and more. They even took the time to give back to the community, spending a day shoveling sand off of steps in Pacific Beach. They said a police officer and surfer stopped to thank them, the surfer adding that he had slipped on those steps because of the built-up sand.“We swept the stairs because we wanted to help people not get any injuries from slipping on the sand,” said Max.The week may have been different than a typical summer camp, but all three said they had the best time."I would just like to say thank you for being my parents and thank you for doing all this stuff for me," said Max."You’re welcome, Max. We love you," responded Tim and Joy. 1591

MANITOWOC, Wis. – Democratic presidential nominee Joe Biden made a campaign stop in Wisconsin on Monday.The former vice president delivered a speech in Manitowoc, during which he accused President Donald Trump of only having the best interest of his supporters in mind. In contrast, Biden said he would be a president for all Americans, even those who don't support him.Watch the event below:Biden also spoke about the COVID-19 pandemic as the country’s death toll from the coronavirus approaches 200,000. The events marks Biden's second trip to the swing state this year and it comes just days after Trump held a rally there. Democrats are hoping to win the traditionally blue state back in November, four years after Republicans carried it by fewer than 23,000 votes.The stop also came after the death of Supreme Court Justice Ruth Bader Ginsburg, which has turned the general election on its head. 908

来源：资阳报