People who suffer from psychosis are about three times more likely to be smokers, but scientists have long scratched their heads over which one leads to the other.
A convoy carrying the coffins of 136 newly-identified Srebrenica victims arrived in the Bosnian town where the massacre took place, for their burial on the 20th anniversary.
International Monetary Fund Managing Director Christine Lagarde said that a new program to prop up Greece's finances would require creditors to restructure debt.
Greek banks will remain closed until Monday, the finance ministry said as the government raced to come up with a new proposal to present to creditors in a last-minute drive to avert a eurozone exit.
Russian President Vladimir Putin welcomed the leaders of emerging powers for a summit Moscow hopes will show it not isolated despite the standoff with the West over Ukraine.
Russian President Vladimir Putin is to meet world leaders including China's Xi Jingping and India's Narendra Modi ahead of the start of a summit of the BRICS emerging economies.
Greece's economic turbulence is dominating political debate in Spain ahead of a year-end general election, with the ruling conservatives pointing to Syriza's difficulties to discredit its Spanish ally Podemos.
Rocketing housing costs in Britain's capital have fuelled a surge in Londoners seeking cheaper accommodation on boats, with increased numbers putting pressure on the city's historic network of rivers and canals.
Prime Minister Aleksandar Vucic of Serbia said he would attend the 20th anniversary commemoration of the Srebrenica massacre this weekend in a bid to forge reconciliation.
German Chancellor Angela Merkel said that there was still no basis for talks on a new Greek bailout, as she arrived in Brussels for an emergency summit of eurozone leaders.
European Commission head Jean-Claude Juncker said he was against an exit by Greece from the euro, even though Greeks massively rejected bailout terms in a referendum this weekend.