Small crustacean can fragment microplastics in four days, study finds

‘Completely unexpected’ finding is significant as harmful effects of plastic might increase as particle size decreases

Small crustaceans can fragment microplastics into pieces smaller than a cell within 96 hours, a study has shown.

Until now, plastic fragmentation has been largely attributed to slow physical processes such as sunlight and wave action, which can take years and even decades.

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Seeking life on Mars: Nasa prepares to launch its latest rover

Perseverance mission aims to land on crater to search for possible microbial Martians

Nasa’s most sophisticated rover yet is due to blast off for Mars on a mission to answer one of the most profound questions: did life ever emerge on another planet?

Mission controllers have set their sights on the 28-mile-wide (45km) Jezero crater north of the planet’s equator. The landing site is one of the most promising spots for any microbial Martians to have been preserved in rock formed when the crater held a lake nine times larger than Loch Ness.

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Germany’s Covid-19 fears grow over ‘reckless’ partygoers

Authorities warn of rise in cases after shocking footage of young revellers in Spain and Bulgaria

Young Germans partying abroad on Europe’s beaches and ignoring physical distancing rules are becoming an increasing cause of concern at home, as coronavirus cases continue to rise across the world.

Following widespread reports earlier this month of German tourists revelling on the Spanish island of Mallorca, bars and clubs on the infamous “Bier Straße” were forced by local authorities to close.

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‘One big wave’ – why the Covid-19 second wave may not exist

With no evidence of seasonal variations, the WHO warns the initial coronavirus pandemic is continuing and accelerating

The Covid-19 pandemic is currently unfolding in “one big wave” with no evidence that it follows seasonal variations common to influenza and other coronaviruses, such as the common cold, the World Health Organization has warned.

Amid continued debates over what constitutes a second wave, a resurgence or seasonal return of the disease, Margaret Harris, a WHO spokesperson, insisted that these discussions are not a helpful way to understand the spread of the disease.

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Coronavirus live news: US deaths near 150,000 as Italy extends state of emergency

Trump blames US case surge on protestors; WHO warns pandemic is “one big wave”, not seasonal; Air travel not expected to recover until 2024. Follow the latest updates

Florida reported another record one-day rise in coronavirus deaths on Tuesday, and cases in Texas passed the 400,000 mark, fueling fear that the United States is still not taking control of the outbreak and adding pressure on Congress to pass another massive economic aid package.

Public health experts are becoming concerned about the levels of infection in states such as Ohio, Indiana, Tennessee and Kentucky, while the surge in Florida along with Texas, Arizona and California this month has strained many hospitals.

Related: Covid-19: Florida reports record one-day deaths as concerns grow for other states

US officials say Russian intelligence services are using a trio of English-language websites to spread disinformation about the coronavirus pandemic, seeking to exploit a crisis that America is struggling to contain ahead of the presidential election in November.

Two Russians who have held senior roles in Moscow’s military intelligence service known as the GRU have been identified as responsible for a disinformation effort reaching American and western audiences, US government officials said on Tuesday. They spoke to the Associated Press on condition of anonymity because they were not authorized to speak publicly.

Related: Russia used English-language sites to spread Covid-19 disinformation, US officials say

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Coronavirus live news: US deaths near 150,000 as Hong Kong warns hospitals could collapse

Hong Kong outbreak ‘overwhelming’ medical system; pilgrims quarantined in Mecca as hajj begins; WHO warns pandemic is ‘one big wave’

The US attorney general William Barr will be tested for Covid-19, after coming in close contact with Texas Republican congressman Louie Gohmert on Tuesday when Barr testified before the House Judiciary Committee, a Justice Department spokeswoman confirmed to Reuters.

Department spokeswoman Kerri Kupec added that Barr already faces routine testing for Covid-19 at the White House.

Berlin’s Tegel airport began large-scale coronavirus testing on Wednesday, as airports across Germany prepared for the advent of free, compulsory testing for many passengers from next week.

Two rooms were set aside for tests, but an airport spokeswoman said a larger space was being prepared, indicating that authorities are preparing for testing to remain a fixture for a long time to come.

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Scientists successfully revive 100m-year-old microbes from the sea

Microbes had lain dormant at the bottom of the sea since the age of the dinosaurs

Scientists have successfully revived microbes that had lain dormant at the bottom of the sea since the age of the dinosaurs, allowing the organisms to eat and even multiply after eons in the deep.

Their research sheds light on the remarkable survival power of some of Earth’s most primitive species, which can exist for tens of millions of years with barely any oxygen or food before springing back to life in the lab.

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Almost 3 billion animals affected by Australian megafires, report shows

Exclusive: Bushfires ‘one of the worst wildlife disasters in modern history’, say scientists

Nearly 3 billion animals were killed or displaced by Australia’s devastating bushfire season of 2019 and 2020, according to scientists who have revealed for the first time the scale of the impact on the country’s native wildlife.

The Guardian has learned that an estimated 143 million mammals, 180 million birds, 51 million frogs and a staggering 2.5 billion reptiles were affected by the fires that burned across the continent. Not all the animals would have been killed by the flames or heat, but scientists say the prospects of survival for those that had withstood the initial impact was “probably not that great” due to the starvation, dehydration and predation by feral animals – mostly cats – that followed.

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Coronavirus live news: Belgium set to tighten restrictions; China reports highest new cases since April

Vietnam evacuates 80,000 tourists from Danang; Spain’s Covid-19 deaths could be 60% higher; global deaths near 650,000

In the US, more than 40 people were infected with the coronavirus after attending a multi-day revival event at a north Alabama Baptist church, the Associated Press reports.

“The whole church has got it, just about,” Al.com quoted pastor Daryl Ross of Warrior Creek Missionary Baptist church in Marshall County as saying.

My colleagues over in the US of A have launched their live blog, with coverage of the coronavirus pandemic in the country, its election campaign, protests in Portland and other cities and a lot more besides.

Click the link below to follow their latest updates.

Related: US nears 150,000 Covid-19 deaths as Republicans and Democrats pitch opposing plans – live

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Know sweat: scientists solve mystery behind body odour

University of York researchers trace the source of underarm aromas to a particular enzyme

Scientists have unravelled the mysterious mechanism behind the armpit’s ability to produce the pungent smell of body odour.

Researchers at the University of York traced the source of underarm odour to a particular enzyme in a certain microbe that lives in the human armpit.

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The US withdrawal from the Paris climate accord will hurt people of color most | Adrienne Hollis

The Paris agreement threw a lifeline to millions of people of color facing a premature death. Trump is tearing that away

It’s official – in 100 days the United States will formally withdraw from the Paris climate agreement. The impact of Donald Trump’s decision, taken three years ago, is already being felt by environmental justice communities.

Racism is the driving force behind why certain people and places face disproportionate environmental exposure to toxic substances, adverse climate change effects, Covid-19 infections and deaths. This raises the question: was withdrawing from the Paris agreement also a racist decision? How will this morally incomprehensible policy change affect Black, Latinx, Indigenous and other communities of color?

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Britain wins rare praise for leading race to test life-saving Covid drugs

UK’s high infection rate and centralised NHS have enabled Recovery team to help victims across the world

It has been a startling week for those following Britain’s response to the pandemic. Roundly derided for the lateness of its lockdown and its bungled testing programmes, the UK was the unexpected recipient of a sudden bout of lavish praise for its scientists’ efforts to combat the d isease.

“The Brits are on course to save the world,” wrote leading US economist Tyler Cowen in Bloomberg Opinion, while the journal Science quoted leading international scientists who have heaped praise on British researchers’ anti-Covid work.

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Coronavirus live news: UK to announce tourists returning from Spain must quarantine for two weeks

Johnny Depp’s in-person court case ‘galling’; Germany may introduce compulsory testing; funeral fees rise in Great Britain

This from my colleague Sam Jones in Madrid:

A spokeswoman for the Spanish government declined to comment on the reported quarantine measures, instead referring the Guardian to comments made on Friday by the foreign minister, Arancha González Laya.

Scotland’s first minister, Nicola Sturgeon, has said that people returning to any part of the UK from Spain will have to quarantine from midnight.

“Spain will be removed from the list of countries exempt from quarantine requirements due to an increased number of cases of coronavirus (Covid-19) in the last few days,” Scotland’s government said in a statement.

Having reviewed the latest data earlier today, @scotgov is also reimposing 14 day quarantine for travellers returning from Spain. This reinforces the point that these matters are subject to change at short notice & so my advice is to be cautious about non essential foreign travel https://t.co/9xSnyFCv77

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Cooking eased my exile and became my homage to the lives of immigrants

Preparing food helped me reconcile my old and new world. Now my restaurant produces a beautiful mongrel cuisine

‘Now you better behave and don’t cry!” was the warning from my mother, shot with a stern look to show she was deadly serious. We disembarked from the aircraft at Heathrow. It was a dark and dank day. Cold rain spat at us as we walked across the tarmac into the immigration hall. In the terminal, the world seemed full of strangers and I swallowed back my tears.

The sunless flat above a shop that my father had found for us was full of draughts and damp. At the makeshift kitchen table, I stared at the exposed electrical wires knotted together on the wall and pined for the warmth of the neat, beloved grandmother we had left behind in our haste to leave Kenya. England welcomed immigrants, but its housing did not. Back home, when you opened the door, every room was fragrant with the scent of ripening guavas. Here, there was just a solitary freckled apple in the fruit bowl that, like us, had seen better days.

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‘Major’ breakthrough in Covid-19 drug makes UK professors millionaires

Synairgen’s share price rises 540% on morning of news of successful drugs trial

Three professors at the University of Southampton school of medicine have this week made a “major breakthrough” in the treatment of coronavirus patients and become paper millionaires at the same time.

Almost two decades ago professors Ratko Djukanovic, Stephen Holgate and Donna Davies discovered that people with asthma and chronic lung disease lacked a protein called interferon beta, which helps fight off the common cold. They worked out that patients’ defences against viral infection could be boosted if the missing protein were replaced.

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‘A wicked enemy’: how Australia’s coronavirus success story unravelled

Weeks ago, Australia was the envy of the world. Now it has more than 3,000 active coronavirus cases and Melbourne is in lockdown. What went wrong?

Less than a month ago, Australia was the envy of much of the world. With daily new coronavirus cases in the single digits, it was feted as part of a group of “first mover” nations - countries like Taiwan, Singapore and New Zealand that acted decisively to quash coronavirus.

In mid-June, after three months of tight restrictions and differing levels of lockdown, life was not quite back to normal, but as politicians liked to stress, it was almost Covid-normal.

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Why smokers and vapers – and those around them – may face higher Covid-19 danger

New reports cast doubt on early claims smoking offered protection from disease

At the beginning of the pandemic, smokers may have thought they had little to worry about, as there was a sliver of good news for them: a study circulating on social media suggested smoking could be associated with a lower risk of contracting Covid-19. That’s not the full story.

Related: Biden predicts Trump will try to 'steal the election' by fighting mail-in voting – live

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Coronavirus live news: US cases top 4m as WHO chief chides Pompeo for ‘untrue’ claims

US Secretary of State’s reported comments ‘untrue, unacceptable and without foundation’ says WHO; Trump cancels Jacksonville RNC; Bolsonaro not distancing despite positive test. Follow the latest updates

US infectious diseases expert Anthony Fauci has thrown out the first pitch at a Nationals-Yankees game, and it didn’t go amazingly well, but it did lead to some okay Covid-19 jokes:

Fauci finally flattened the curve pic.twitter.com/I0zUwbl6OH

The US surpassed 4m coronavirus cases on Thursday, after more than 1,100 new Covid-19-related deaths were reported in a single day on Wednesday for the first time since late May.

As states continue to dial back reopening efforts, nearly every metric for tracking the outbreak has shown a worsening spread. The US politicians volunteering other people’s lives to fight Covid-19Read more

Related: US surpasses 4m Covid-19 cases as states dial back reopening

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Coronavirus live news: record daily rise in global cases with almost 285,000 new infections

Biggest increases were from the US, Brazil, India and South Africa, according to the World Health Organization

Brazil has registered an additional 1,156 deaths over the last 24 hours and another 55,891 confirmed cases, the health ministry has said. The South American nation has now registered 85,238 deaths and 2,343,366 total confirmed cases.

Footage of Niagara Falls tour boats highlights the stark differences in physical distancing between Canadian and US-managed companies.

The Canadian tour company Hornblower Niagara Cruises’s ships can carry up to 700 people but Ontario’s strict rules have permitted them to carry only six passengers at a time.

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Cost of preventing next pandemic ‘equal to just 2% of Covid-19 economic damage’

World must act now to protect wildlife in order to stop future virus crises, say scientists

The cost of preventing further pandemics over the next decade by protecting wildlife and forests would equate to just 2% of the estimated financial damage caused by Covid-19, according to a new analysis.

Two new viruses a year had spilled from their wildlife hosts into humans over the last century, the researchers said, with the growing destruction of nature meaning the risk today is higher than ever.

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