At precisely midday in Washington on 20 January, Barack Obama's eight years as US president will end. Mr Obama will join 11 previous two-term presidents in a dead heat as the nation's second longest serving head of state.

Dive deep enough into the world's oceans and you will enter the twilight zone. This region, between 200 and 1,000m beneath the ocean's surface, earns its name because only the faintest hints of sunlight can reach such depths. The rest is absorbed and lost in the waters above.

At least 10,000 people have been killed in the war in Yemen between Houthi rebels and the Saudi-led coalition supporting the government, the UN says. The organisation said the death toll "underscores the need to resolve the situation" that has lasted for more than 21 months.

China's capital is notorious for its chronic pollution. Even indoors it's a struggle to find clean air, says John Sudworth. Having already taped most of my windows shut, I have now started on the air conditioning vents. The aim is simple - to close off every access point through which the toxic outside air leaks into our Beijing home.

A TV listing of President-elect Donald Trump's inauguration has caught people's attention both in the UK and the US. The Sunday Herald TV critic Damian Love reimagined the ceremony as a return of the classic science fiction series The Twilight Zone.

From the section Entertainment & Arts "It is the customary fate of new truths," wrote TH Huxley, in one of my favourite quotes, "to begin as heresies, and end as superstitions." Fake news is nothing new, depending on what you mean by it.

Georgia congressman and civil rights icon John Lewis used a Martin Luther King Day address to call on Americans to always speak out against hate. He was speaking after Mr Trump lashed out at him on Twitter Mr Lewis had said the brash New York businessman was not a "legitimate president" and that he would boycott his inauguration.

Main suspect in New Year's Eve attack on Reina nightclub in Istanbul captured, Turkish media report

Now, Ivanka Trump is poised to become one of the most influential -- and powerful -- first daughters in US history. Like few others in the incoming president's orbit, Trump has her father's ear and his trust. "She . . . has a great way of being able to, you know, talk to him," Ivanka's brother Don Jr.

Authorities have arrested the wife of Pulse nightclub shooter Omar Mateen in connection with their investigation into the June mass shooting, FBI spokesman Prentice Danner said. Noor Salman was arrested in the San Francisco area Monday morning, Danner said.

Trump's comments more than two years ago, which came in the wake of Russian incursions into Crimea, offer a sharp contrast to the Russia-friendly rhetoric he has employed since launching his presidential campaign.

The move, which wasn't previously outlined and is likely one of the final foreign policy decisions of Obama's term, terminates a decades-long policy that many argued amounted to preferential treatment for a single group of migrants. "By taking this step, we are treating Cuban migrants the same way we treat migrants from other countries," Obama wrote in a statement Thursday.

But they're in it together, and the two appear to be taking steps together against US global hegemony. The countries released a joint statement this week voicing their opposition to US and South Korean plans to deploy the Terminal High Altitude Area Defense (THAAD) missile system, according to both Russian and Chinese state media.

ISIS has destroyed all five bridges crossing the Tigris River in Mosul, an attempt to slow the advance of Iraqi troops toward the western side of the city, according to Lt. Gen. Abdul Amir Rasheed Yarallah, the commander of Iraqi Forces in Nineveh province.

John Lewis, the politician, does not see Mr. Trump as a legitimate President because he believes that Russians helped him get elected.

Colombian risk management authorities said excess weight led to the bridge's collapse Monday. An eyewitness told local media that some 20 people were on the bridge when the ropes holding up the left side of it snapped. The bridge stood at a height of 10 to 15 meters (32 to 49 feet).

Aziz Osmanoglu and Sehabat Kocabas, who also are Turkish nationals, refused for religious reasons to send their two daughters to swimming lessons at their school in Basel, Switzerland. The parents, who have been pressing this case for nearly a decade, argued that sending their children to swimming lessons with boys contravened Article 9 of the European Convention on Human Rights -- the right to freedom of thought, conscience and religion.

The deadly spread of cancer around the body has been cut by three-quarters in animal experiments, say scientists. Tumours can "seed" themselves elsewhere in the body and this process is behind 90% of cancer deaths. The mouse study, published in Nature, showed altering the immune system slowed the spread of skin cancers to the lungs.

Donald Trump has described as "fake news" allegations published in some media that his election team colluded with Russia - and that Russia held compromising material about his private life. The BBC's Paul Wood saw the allegations before the election, and reports on the fallout now they have come to light.