The former vice-president, whose campaign had faltered, claims a huge win in South Carolina's primary.
A Joe Biden comeback could be under way after a big win in the latest Democratic contest to find a Trump challenger.
President Donald Trump says more cases are "likely" but urges people not to panic.
Nasa says major decreases in nitrogen dioxide levels are "at least partly" linked to the outbreak.
Justin Trudeau is under pressure, companies are getting spooked and farms are running low on fuel.
The US president says 5,000 troops will leave Afghanistan by May and he will meet Taliban leaders.
Director Mohammad Rasoulof is banned from leaving Iran and filmed There Is No Evil in secret.
President Erdogan "opened the doors" for them to exit, saying his country can no longer host them.
PM Peter Pellegrini admits defeat as the Ordinary People party secures a quarter of votes.
The leading civil servant says he is the victim of a "vicious and orchestrated" campaign.
Thousands take to the streets of Moscow to mark five years since the murder of Boris Nemtsov.
Australian vet Olivia Clarke saved the life of Monty, an 18-year-old jungle carpet python.
Boris Johnson and Carrie Symonds, who says she feels "blessed", are expecting the baby this summer.
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