1 . Sportsmen in the running races of the Olympics are great athletes, but even the slow runners of the running world — joggers in the park — have good health. A study out this week in the Journal of the American College of Cardiology finds that even 5 to 10 minutes a day of slow running is enough to extend life by several years, compared with not running at all.

The new study focused on a group of more than 55, 000 men and women aged 18 to 100. About a quarter of them were runners. Over 15 years, those who ran just 50 minutes a week or fewer at a slow speed were less likely to die from either cardiovascular (心血管的) disease or other causes, compared with those who didn’t run at all.

The study suggests relatively low efforts are necessary to benefit from jogging, but it can be better to exercise more often. “A little bit is good but a little more is probably better,” says Dr. Aaron Baggish. A 2013 study in Denmark suggested that the secret of maximum longevity is up to 2. 5 hours of running a week.

Although running can make you less likely to have cardiovascular disease, it doesn’t entirely take the risk away from you. “There is no question that the healthier you are and the more exercise you do, the longer you’ll live and the better your quality of life will be,” Dr. Baggish says. “But it doesn’t mean you’ll never get sick.”

“Many long-term runners do not run because they want to live longer,” Dr. Baggish notes. “They run because it makes them feel better every day.”

For these runners, the cost of feeling good can be injuries, so Dr. Baggish supports the value of what he calls “active rest.” His belief, not supported by any recent research, is that it’s a good idea to spend 25% of exercise time over the course of a year running at a slow speed or doing other activities like swimming or biking.

9 . The world has faced a food crisis of unprecedented(前所未有的) proportions in 2022—the largest in modern history, as conflict, the COVID-19 pandemic, climate crisis and rising costs have combined to pose great risks for hungry people across the world. As many as 828 million people go to bed hungry every night. The number of those facing acute food insecurity has risen from 135 million to 345 million since 2019. A total of 49 million people in 49 countries are suffering hunger, according to figures from the United Nations’ World Food Programme.

“We are facing an unprecedented global food crisis and all signs suggest we have not yet seen the worst. For the last three years, hunger numbers have repeatedly hit new peaks,” WFP Executive Director David Beasley said. He warned that things can and will get worse unless there is a large-scale and coordinated(协调一致的) effort to address the causes of this crisis.

There are many reasons for prevailing high levels of food insecurity. These reasons include conflicts, climate changes and weather extremes, economic slowdowns and downturns. In addition, these drivers often do not act alone. For instance, conflicts are often accompanied by economic downturns, which affect livelihoods and the ability of people to earn resources, leading to increasing poverty levels and higher prevalence(流行) of food insecurity.

Unfortunately, the main reasons for high levels of food insecurity have not improved this year. People in the Horn of Africa are facing a fifth consecutive(连续的) failed rain season in parts of Ethiopia, Kenya and Somalia, which will constrain their production, and is likely to push many people deeper into food insecurity.

Moreover, there is uncertainty about the weather. And climatic shock affecting any major producer or exporter will introduce additional uncertainty into production and consequently prices, which in turn impact the ability to purchase food, particularly of the most vulnerable people.

10 . Around 6,200 years ago, farmers living on the eastern edges of Europe, in what is now Ukraine, left their villages. They moved into an area between the modern cities of Kiev and Odessa. They built new settlements up to 20 times the size of their old ones. Scientists believe the civilization might be an early attempt at urbanization. But it isn’t clear whether the sites, or perhaps the earliest cities, were fully inhabited (居住) year round and there is heated debate over what they were for.

This puzzling culture, known as the Cucuteni-Trypillia, predates the earliest known cities in Mesopotamia. Researcher Monica Smith, the author of Cities: The First 6.000 Years, thinks the very large sites may have had something in common with Gobekli Tepe in modern Turkey. It is a building complex which is at least 10,000 years old and seems to have been a place where people gathered together periodically for special gatherings.

By contrast, scientist Johannes Muller believes the very large sites were fully occupied all year round. But the inhabitants left the lightest of footprints in the landscape, and no human remains have been found. “Not a finger, not a tooth,” says researcher Alexey Nikitin. The evidence is extremely difficult to collect because Trypillians periodically burned their houses down in a controlled way.

Uruk and Tell Brak, which arose in Mesopotamia early in the 4th millennium BCE, are usually considered the world’s first cities. Their remains point to an increased density (密度) of habitation and a hierarchical (等级制度的) social structure-two features that are considered essential to the definition of a city. But the Trypillian sites don’t meet either of those standards.

Scientists John Chapman and Bisserka Gaydarska agree, saying. “Trypillian sites were a social system based on the belief that everyone was equal.” These were cities, but of a very different kind from the slave-owning (拥有奴隶的) societies of Mesopotamia a few centuries later. And our definition of a city may need expanding, argue Chapman and Gaydarska.