Donald Trump does not take office until Jan. 20, but on the world stage he is already acting as if he is US president. President-elect Trump has stamped his seal on US diplomacy on crises in Syria and Ukraine as his second spell in the White House approaches. World leaders have jostled to talk to Trump and he was treated as the guest of honor at the grand reopening of the Notre Dame cathedral in Paris on the weekend. But while Trump was often a diplomatic disruptor in his first term, he faces a more volatile international situation in his second presidency.

SEE SOME OF THE STEPS TRUMP IS TAKING BEFORE OFFICE

Google on Monday showed off a new quantum computing chip that it said was a major breakthrough that could bring practical quantum computing closer to reality. A custom chip called "Willow" does in minutes what it would take leading supercomputers 10 septillion years to complete, according to Google Quantum AI founder Hartmut Neven, whose team of about 300 people at Google is on a mission to build quantum computing capable of handling otherwise unsolvable problems like safe fusion power and stopping climate change.

HOW LONG BEFORE QUANTUM COMPUTING CAN SAVE WORLD?

Rupert Murdoch's bid to cement his eldest's son's control over one of the world's most influential media empires has failed. The first family of news -- commanding a stable that includes Fox News, The Wall Street Journal and a host of British and Australian media -- inspired the hit TV series "Succession." Murdoch, 93, had long intended that his children inherit the empire, and jointly decide its direction. But in recent years Murdoch has grown concerned that Fox News -- the crown jewels of the collection -- might drift away from its lucrative right-wing moorings.

SEE HOW THE REAL-LIFE DRAMA IS PLAYING OUT IN COURT

What and when were Rupert Murdoch's first US media acquisitions?

Monday's answer: A total of 12 humans have walked on the Moon -- Neil Armstrong was first (1969) and Eugene Cernan was last (1972).