快科技8月22日消息，此前一直很少在公共社交平台露面的韦东奕，近日突然在个人账号更新了多期数学专项解题视频，还同步上架了一本面向中小学生的数学练习册。北京大学相关工作人员已经出面证实，该账号确实为韦东奕本人运营，上架的练习册由他亲自牵头主编，另有9位业内专业编委共同参与了整套内容的打磨编撰。

二 |     A "super fog" in Louisiana has caused a multi-car pileup on Interstate 55 near New Orleans, Louisiana, after severely lowering visibility, according to police.The crash, involving dozens of cars, occurred on Monday morning due to heavy fog conditions, according to Louisiana State Police. A long stretch of Interstate 55, a 24-mile-long highway over Lake Pontchartrain near New Orleans, is expected to be closed "for the foreseeable future," police said.Interstate 10 and Interstate 310 were also closed as a result of the crash, police said. Louisiana Gov. John Bel Edwards confirmed the accident in a statement Monday that there were fatalities in the crash, but did not say how many people were killed or injured.For hours after the crash, emergency crews worked to clear debris from both northbound and southbound lanes, according to state police.The super fog was caused by smoke from marsh fires burning in the region combined with dense fog developing in the area early Monday morning bringing extremely low visibility. In some spots, visibility was near zero, creating dangerous driving conditions.Super fogs typically form when condensed water vapor mixes with the smoke and moisture released from damp organic material smoldering from a nearby fire, such as brush, leaves and trees, according to the National Weather Service. Visibility can be lowered to less than 10 feet as a result, according to the NWS.This has been occurring in the region over the past several mornings, with the location of the densest fog and most dangerous conditions varying day to day, forecasts show.Super fogs can be especially dangerous when they develop near and over highways. The localized nature of the weather phenomenon means that visibility conditions can worsen rapidly within a very short distance, which can lead to a hazardous combination of sudden low to near-zero visibility and vehicles traveling at a high speed on a highway.The very limited visibility then hinders a driver's ability to react to changing conditions on a roadway.The National Weather Service issued a dense fog advisory for much of southeastern Louisiana on Monday morning, including from Baton Rouge to New Orleans.Over the past several days, the National Weather Service has been warning of the threat of dense fog during the early mornings in the region that would be worsened in some areas by nearby marsh fires. State police advised drivers to use their low-beam headlights if they can't see at least 500 feet in front of them.The fog dissipated by mid Monday morning, and all fog alerts have since been canceled.While areas of smoke will continue to be possible in the area as various marsh fires continue to burn, fog is not forecast to be a major issue Monday night, as weather conditions will be less favorable for fog development.Morning fog is not uncommon this time of the year for the region, but more than 86% of the state is currently battling extreme drought conditions, which is elevating fire danger. This could mean more instances of super fog in the coming days and weeks as cooler temperatures settle in, but the drought and wildfire risk persist.In addition, devastating drought and wildfire conditions continue to impact Louisiana. More than 60% of the state is now categorized at exceptional drought, the highest category of concern, according to the U.S. Drought Monitor. Just three months ago, 0% of the state was listed under exceptional drought."The combination of wildfire smoke and dense fog is dangerous, and I want to encourage all Louisianans in affected areas to take extreme caution when traveling," Edwards said in a statement.State troopers are working to notify families and investigate the exact cause of the crash, according to state police.It is unclear how many fatalities and injuries occurred as a result of the crash. The St. John the Baptist Parish Sheriff's Office directed media requests to Louisiana State Police.Additional information was not immediately available. Louisiana State Police did not immediately reply to ABC News' request for comment.。这本练习册上架没几天，仅单一主流电商平台的销量就突破了2万件，全平台累计销售额已经达到数十万元，不少学生和家长冲着韦东奕“北大数学大神”的口碑直接下单，希望能跟着顶尖学者总结的思路快速提升数学成绩。这件事曝光后很快就在全网引发大范围讨论，网友的态度直接分成了几个完全对立的阵营。有不少人力挺这种知识变现的模式，认为顶尖数学家下沉做基础教育内容，是普通中小学生的福气，靠专业能力赚钱完全无可指摘。也有一部分人觉得韦东奕这种级别的顶尖科研人才，本该把全部精力投入到前沿数学研究中，花时间做中小学教辅属于纯粹的大材小用。还有不少拥有十数年教龄的资深中学数学教师特意站出来提醒，韦东奕的解题思路和思维逻辑本身更适配数学天赋突出的孩子，普通孩子没必要盲目跟风囤书硬啃，很容易跟不上节奏反而打击学习信心。目前韦东奕本人还没有针对网上的各类争议作出任何公开回应。