World shares were mostly lower on Friday, with Tokyo's benchmark closing down more than 2% after a sell-off on Wall Street.

A report was due later Friday from the U.S. Labor Department on how many workers U.S. employers hired last month. Economists are expecting to see an acceleration in hiring for February.

China's exports rose a less-than-expected 2.3% in January and February from a year earlier while imports fell more than 8% in a slow start to a year dogged by uncertainty over U.S. tariffs and other policies.

Economists had forecast that exports would rise 5% year-on-year and that imports would edge higher. China's overall trade surplus grew to $170.52 billion in the first two months of the year.

America's butterflies are disappearing because of insecticides, climate change and habitat loss, with the number of the winged beauties down 22% since 2000, a new study finds.

The first countrywide systematic analysis of butterfly abundance found that the number of butterflies in the Lower 48 states has been falling on average 1.3% a year since the turn of the century, with 114 species showing significant declines and only nine increasing, according to a study in Thursday's journal Science.

Five cities in southern Brazil suspended classes Thursday due to a heat wave, authorities said, as temperatures in some places rose as high as 36 degrees Celsius (97 degrees Fahrenheit).

Rio Grande, one of the five cities — all of which are in the southern state of Rio Grande do Sul — said its schools were not equipped to handle the extreme heat. Classes were expected to resume on Monday.

The U.S. labor market likely kept on churning out jobs last month, economists say, but the outlook is cloudy and getting cloudier as the Trump administration wages trade wars, purges federal employees and seeks to deport millions of immigrants.

When the Labor Department releases February jobs numbers Friday, they're expected to show that employers added 160,000 jobs. That's far from spectacular but it's solid, and it's up from 143,000 in January. The unemployment rate is forecast to stay at a low 4%, according to economists surveyed by the data firm FactSet.

Manchester United settled for a 1-1 draw with Real Sociedad in the first leg of the Europa League round of 16 on Thursday.

United led on Joshua Zirkzee's goal in the 58th minute but the hosts equalized 12 minutes later after Bruno Fernandes' hand ball. Mikel Oyarzabal sent Andre Onana the wrong way from the penalty spot.

This ancient form of football has a rule forbidding players from murdering each other.

Every year, thousands of people descend on a small town in the English countryside to watch a two-day game of mass street football that, to the casual observer, could easily be mistaken for a riot.

Farmers and meat producers across the U.S. can expect the new tariffs on Mexico, Canada and China and the retaliatory action from those countries to hurt their bottom lines by billions of dollars if they stay in place a while, and consumers could quickly see higher prices for produce and ground beef.

But some of the impact on farmers might not be felt until the next harvest and some products might actually get cheaper in the short run for consumers if exports suffer. And the price of corn, wheat and soybeans accounts for relatively little of the price of most products. Plus, President Donald Trump could offer farmers significant aid payments, as he did during the trade war with China during his first administration, to offset some of the losses.

The U.S. government will stop sharing air quality data gathered from its embassies and consulates, worrying local scientists and experts who say the effort was vital to monitor global air quality and improve public health.

In response to an inquiry from The Associated Press, the State Department said Wednesday that its air quality monitoring program would no longer transmit air pollution data from embassies and consulates to the Environmental Protection Agency's AirNow app and other platforms, which allowed locals in various countries, along with scientists around the globe, to see and analyze air quality in cities around the world.

The aristocrats of the Habsburg royal court who danced in the first of Vienna 's famed balls in the 18th century could never have imagined how the hallmark of the Austrian capital's social and cultural scene would evolve.

Today, teenagers learn to waltz by watching YouTube videos while ladies shed their elbow-length gloves to better swipe on smartphones.