The World Tonight

China's President has told Donald Trump that their countries have a responsibility to ensure that AI remains under human control. President Xi was speaking during talks at the White House on the first full day of his state visit. We hear from a former US government adviser on artificial intelligence.

Also on the programme: daily migrant crossings from France reach their highest level this year; and the Kenyan elephants making their own medicine.

Blood tests have revealed that people living near a factory in Lancashire have higher levels of a so-called "forever chemical" that was once used at the site. PFOA was previously used in the manufacture of non-stick saucepans at the plant in Thornton-Cleveleys. We hear from a resident who received blood tests results today.

Also on the programme: Chinese leader Xi Jinping touches down in Washington; and the Welsh words and phrases earning their place in the Oxford English Dictionary.

The prime minister meets the US president for the first time in New York, on the sidelines of the UN General Assembly. We speak live to our political editor, who has been in the room asking questions. Also on the programme: Billionaire businessman Sir Jim Ratcliffe suspends production at three of his chemical plants in Hull, citing high UK gas prices. And why do films written by women rake in a higher profit than those written by men? We hear from one female screen writer.

CNN, Politico and MS NOW are taking legal action against the Trump administration after their journalists' credentials were revoked. We hear from one journalist, once described as Mr Trump's antagonist-in-chief, who has personal experience of being shut out of the White House.

The head of an independent review into young people's mental health in England has said he is concerned about the high numbers of children self-harming. One father, whose son and daughter have both self-harmed, tells us about his family's experience.

And Scotland has long been considered the 'Home of Golf' - but could the real origins of the sport actually be somewhere else entirely?