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In the first of two profiles of the leading candidates in the race to become Brazil's new president, Katy Watson asks if incumbent Jair Bolsonaro is - as his fans argue - a great leader, or someone who disdains democracy.

Ilya Smirin was broadcasting live during the ninth round of the Women's Grand Prix on Tuesday. The Israeli grandmaster admitted on air he had said chess is "maybe not for women" - and also seemingly praised a woman for playing like a man.

Campaigner Charlotte Gage says that the outdoor adverts you see on billboards and bus stops should all be removed. Ms Gage is the network director of UK pressure group Adfree Cities, which wants a complete ban on all outdoor corporate advertising.

The blast was the second largest of its kind in 30 years, and the biggest since the fireball over Chelyabinsk in Russia six years ago. But it went largely unnoticed until now because it blew up over the Bering Sea, off Russia's Kamchatka Peninsula.

World chess champion Magnus Carlsen has for the first time openly accused fellow player Hans Niemann of cheating. In a statement, he said he believed Mr Niemann had "cheated more — and more recently — than he has publicly admitted", though offered no evidence.

To play this video you need to enable JavaScript in your browser.The American space agency's Dart probe has smashed into an asteroid, destroying itself in the process.

In the coming hours, the American space agency will crash a probe into an asteroid. Nasa's Dart mission wants to see how difficult it would be to stop a sizeable space rock from hitting Earth.

The suspect, a 21-year-old Dutch man, was detained by police in the Netherlands, according to the National Public Prosecutor's Office. Three other Dutch men were also arrested in Holland on Friday night.

Double Olympic champion Eliud Kipchoge has broken his own men's marathon world record at Sunday's race in Berlin. The 37-year-old Kenyan crossed the line in a time of two hours, one minute and nine seconds, to beat his previous best by 30 seconds.

When Magnus Carlsen and Hans Niemann sat down to play each other earlier this month in the third round of chess's Sinquefield Cup, few could have predicted the chaos that would unfold.

A genetically engineered version of a virus that normally causes cold sores shows real promise for treating skin cancer, say researchers.The modified herpes virus is harmless to normal cells but when injected into tumours it replicates and releases substances to help fight the cancer.

A new type of cancer therapy that uses a common virus to infect and destroy harmful cells is showing big promise in early human trials, say UK scientists. One patient's cancer vanished, while others saw their tumours shrink.

The Turk, also known as the Mechanical Turk or Automaton Chess Player (German: Schachtürke, lit. 'chess Turk'; Hungarian: A Török), was a fraudulent chess-playing machine constructed in the late 18th century.

Allegations of cheating – including wild speculation involving vibrating anal beads – have rocked chess to its core.

To play this video you need to enable JavaScript in your browser.Donald Trump and three of his children have been hit with a fraud lawsuit after a New York investigation into their family company - the Trump Organization.

Emergency workers are searching for a group of people who disappeared while on a spiritual retreat in the Andes. Drones and dogs are being deployed to comb the mountainous area around La Grita, in Venezuela's Táchira state.

Evidence of the earliest use of the narcotic opium has been found in an ancient burial site in Israel. Traces were discovered by archaeologists in pottery vessels at the complex in Yehud, about 11km (7 miles) south-east of Tel Aviv.

To play this video you need to enable JavaScript in your browser.The US space agency's Perseverance rover is close to completing its first set of objectives on Mars.

It is a very modern dilemma. Should you hand your child a smartphone, or keep them away from the devices as long as possible? As a parent, you'd be forgiven for thinking of a smartphone as a sort of Pandora's box with the ability to unleash all the world's evils on your child's wholesome life.

To play this video you need to enable JavaScript in your browser.An innovation to improve safety on the roads for Swedish drivers has won one of this year's Ig Nobel prizes.