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As the president showed off the renovated section of the barrier to reporters, a balloon depicting Trump as a baby floated further down the border. And as Trump landed in California, the state's governor ripped the president's push for Congress to pass legislation that would tighten asylum rules to make it harder for people to qualify.

As technology evolves, perhaps bioprinting functional organs, one of the most exciting applications of 3D printing, is not that far away.

As the COVID-19 outbreak is still raging worldwide, the ensuing global recession makes it more challenging to enact the policies needed for mitigation and raises the urgency of understanding how mitigation can be achieved in an employment-and growth-friendly way and with protection for the poor, the IMF said.

As the ranks of people around the world living in cities has grown, so too has the cost of car ownership as well as traffic congestion.

As the largest traffic hub in Central China, Zhengzhou is planning to start non-stop flights to European countries, "providing our citizens opportunities to taste delicious food and wine in Europe after a faster journey", said Liu, who called the direct air route a "new silk road in the air".