The Conversation

It’s a common assumption that exercise in older people is difficult and dangerous, so it’s perhaps best avoided. But this is often not the case – even if these ideas are ingrained in society. Research has repeatedly shown that exercise in older adults is linked with lower disease risk, reduced risk of falls, and better overall health.

What does a pandemic smell like? If dogs could talk, they might be able to tell us.We’re part of an international research team, led by Dominique Grandjean at France’s National Veterinary School of Alfort, that has been training detector dogs to sniff out traces of the novel coronavirus (SARS-CoV-2) since March.

Most adults will remember spending much of their childhood playing outdoors without much parental supervision. But fears for children’s safety plus the demands of modern life mean many parents don’t allow their children the same freedoms.

Scientific publishing is not known for moving rapidly. In normal times, publishing new research can take months, if not years. Researchers prepare a first version of a paper on new findings and submit it to a journal, where it is often rejected, before being resubmitted to another journal, peer-reviewed, revised and, eventually, hopefully published. All scientists are familiar with the process, but few love it or the time it takes. And even after all this effort – for which neither the authors, the peer reviewers, nor most journal editors, are paid – most research papers end up locked away behind expensive journal paywalls. They can only be read by those with access to funds or to institutions that can afford subscriptions.

From July 24, people in England will have to wear a face mask when inside shops, as well as on public transport. This brings England in line with many other countries that have similar rules already in place.

In an open letter published in Harper’s Magazine, 152 writers, including JK Rowling and Margaret Atwood, claim that a climate of “censoriousness” is pervading liberal culture, the latest contribution to an ongoing debate about freedom of speech online.

Panic-stricken headlines about “murder hornets” are thankfully mostly behind us. The nickname may have staying power, but it is certainly unearned. First spotted in British Columbia in August 2019, the Asian giant hornet (Vespa mandarinia) poses little threat to humans. In its native range in East Asia, the giant hornet is chiefly a menace to the livelihoods of beekeepers, provoking concern that it could cause similar problems in North America.

The recently released 2020 ParticipACTION Report Card revealed that Canadian children scored a D+ for “daily physical activity,” an F for “active play” and a D- for “active transportation.” Only 39 per cent of Canadian children and youth achieve recommended physical activity levels. A decline in children’s physical activity isn’t a new trend. However, with COVID-19, there has been further decline in physical activity resulting from public health protocols aimed at curbing the spread of the virus.

On August 30 2019, a comet from outside our solar system was observed by amateur astronomer Gennady Borisov at the MARGO observatory in Crimea. This was only the second time an interstellar comet had ever been recorded. Comet 19 or C/2019 Q4 , as it is now known, made its closest approach to the sun on December 8 2019, roughly coinciding with the first recorded human cases of COVID-19.

Most of us have experienced unwanted calls at home. This is in spite of efforts by regulators, including the Information Commissioner’s Office and Ofcom, whose most recent report shows that around half of the UK population still receive nuisance calls. Many of these unsolicited calls annoy us because they interrupt our dinner or favorite TV show – but some, such as sales or scam calls, can cause distress or even harm.

Pluto, along with many other dwarf planets in the outer solar system, is often thought of as dark, icy and barren – with a surface temperature of just −230°C. But now a new study, published in Nature Geoscience, suggests that the body has had a warm interior ever since it formed, and may still have a liquid, internal ocean under its icy crust.It could mean that other sizable icy dwarf planets may have had early internal oceans too, with some possibly persisting today. This is exciting, as where there’s warm water, there could be life.

Video of police in riot gear clashing with unarmed protesters in the wake of the killing of George Floyd by Minneapolis police officer Derek Chauvin has filled social media feeds. Meanwhile, police surveillance of protesters has remained largely out of sight.