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Dark matter's existence is inferred from the motion of objects affected by its gravitational pull.

Dao later returned to the aircraft, bloodied, saying repeatedly, "I have to go home," according to a passenger who captured the event on video.

David Dollar, a senior fellow at the John L. Thornton China Center of the Brookings Institution in Washington, said that after a lot of rhetoric, what the Trump administration has done so far is very small. He described the small actions against specific products as following the Obama administration's playbook.

Dai Wenyuan, CEO of Chinese AI startup 4Paradigm, said on Thursday that using facial recognition systems at reception desks or in guidance robots cannot be called AI transformation.

DJI wants to use a warehouse it owns in Cerritos, California, to assemble its Mavic 2 Enterprise Dual drones, hoping that the move will make it easier for some US government agencies to make purchases.