Denmark's prime minister announced special restrictions for more than 280,000 people in the northwest of the country on Thursday after a mutated version of the new coronavirus linked to mink farms was found in humans.

Copenhagen warned that the mutation could threaten the effectiveness of any future vaccine.

Agricultural department workers wearing protective suits have eradicated the first nest of giant "murder hornets" discovered in the United States, vacuuming them out of a tree in Washington state.

Bending the curve of nature's rapid decline will require attacking the problem aggressively along several fronts at once, leading scientists warned Thursday.

An American astronaut and two Russian cosmonauts touched down safely on the Kazakhstan steppe on Thursday, completing a 196-day mission that began with the first launch under lockdown conditions.

NASA astronaut Chris Cassidy and Russian cosmonauts Anatoly Ivanishin and Ivan Vagner landed around 150 kilometres (90 miles) southeast of the Kazakh city of Zhezkazgan at 0254 GMT, footage broadcast by the Russian space agency Roscosmos showed.

Brazil's health minister said Tuesday the country would add the Chinese-made CoronaVac vaccine against Covid-19 to its national immunization program, despite a political and diplomatic row over whether to use it.

The International Space Station is now working normally with no danger to its occupants after the crew managed to resolve a series of technical issues overnight, Russia's space agency said Tuesday.

With competition among Earth's telecoms providers as fierce as ever, equipment maker Nokia announced its expansion into a new market on Monday, winning a deal to install the first cellular network on the Moon. 

The coronavirus remains active on human skin for nine hours, Japanese researchers have found, in a discovery they said showed the need for frequent hand washing to combat the Covid-19 pandemic.

Roger Penrose of Britain, Reinhard Genzel of Germany and Andrea Ghez of the US won the Nobel Physics Prize on Tuesday for their research into black holes, the Nobel jury said.

Faces are more important for humans than dogs, according to a brain activity study on how the two species see each other published by a team of Hungarian and Mexican researchers Monday.