Parents and kids today dress alike, listen to the same music, and are friends. Is this a good thing?

Sometimes, when Mr. Ballmer and his 16-year-old daughter, Elizabeth, listen to rock music together and talk about interests both enjoy, such as pop culture, he remembers his more distant relationship with his parents when he was a teenager.

“I would never have said to my mom, ‘Hey, the new Maroon 5 album is really great. How do you like it?’” says Ballmer. “There was just a complete gap in taste.”

Music was not the only gulf. From clothing and hairstyles to activities and expectations, earlier generations of parents and children often appeared to move in separate orbits.

Today, the generation gap has not disappeared, but it is getting narrow in many families. Conversations on subjects such as sex and drugs would not have taken place a generation ago. Now they are comfortable and common. And parent-child activities, from shopping to sports, involve a feeling of mutual trust and friendship that can continue into adulthood.

But family experts warn that the new equality can also result in less respect for parents. “There’s still a lot of strictness and authority on the part of parents out there, but there is a change happening,” says Kerrie, a psychology professor at Lebanon Valley College. “In the middle of that change, there is a lot of confusion among parents.”

Family researchers offer a variety of reasons for these evolving roles and attitudes. They see the 1960s as a turning point. Great cultural changes led to more open communication and a more democratic(民主的) process that encourages everyone to have a say.

“My parents were on the ‘before’ side of that change, but today’s parents, the 40-year-olds, were on the ‘after’ side. ” explains Mr. Ballmer. “It’s not something easily accomplished by parents these days, because life is more difficult to understand or deal with, but sharing interests does make it more fun to be a parent now.”

Despite the life-saving COVID-19 vaccines (疫苗), so many people died in the second year of the pandemic in the US that the nation’s life expectancy dropped for a second year in a row last year, according to a new analysis.

The analysis of government statistics found US life expectancy fell by just under half a year in 2021, adding to a dramatic drop in life expectancy that occurred in 2020. Dr. Steven Woolf, a professor of population health and health expert at Virginia Commonwealth University, who helped conduct the analysis, said many of the deaths occurred in people in the prime of their lives. And Woolf added that it drove the overall US life expectancy to fall to 76.6 years—the lowest in at least 25 years.

“Shame on the US,” said Noreen Goldman, a professor at Princeton University. The 2021 drop came after US life expectancy fell in 2020, dropping by almost two years. It’s unclear why this happened, but Woolf and others thought it may be due in part to some Americans more likely to live in states with fewer restrictions, so they let down their guard more, while often refusing to get vaccinated.

“The deaths that occurred in 2021 were a product not only of a lack of COVID-19 vaccines, which was a factor, but also being in places that didn’t observe policies like masking and social distancing that prevented spread of the virus, which was the main reason,” Woolf said.

The 2021 drop also widened the gap in life expectancy between the US and other countries, the analysis found. That was due primarily to lower vaccination rates in the US, researchers said. The researchers also said a big part of that was fewer restrictions and more vaccine hesitation in the US, which resulted in lower vaccination rates and a much higher death number. The other health problems like heart attack and overweight also played a role, they said.

“We spent a fortune on medical care and we’re a high-income country. Our government should be able to do far better,” Goldman said.

A University College London study looked at car use to conclude that cities have to become car-free to survive. Simply put, if we don't reduce the number of cars in our cities then they will just completely clog up and stop moving.

The study notes the number of cars is actually increasing faster than that of people. In 2019, 80 million cars were built while the population increased by 78 million. And the mass production of those cars was responsible for 4% of global carbon dioxide (CO₂) emissions (排放) ,which is bigger than aviation (航空) and that's before you even fuel them up.

The study authors construct a mathematical model, and residents choose driving their car or taking public transport on the basis of the time it takes to do the trip. “All individuals decide their commuting (通勤) mode trying to reduce their costs, but the result is the overall worst-case situation, where the average commuting time is longer and all people decide to use their car.” write the authors of the study.

Besides, policymakers tend to construct even more car infrastructure (基础设施) and invest even more in private cars, which then encourages more private vehicle use and results in even more traffic jams.

Possible solutions have to be actively encouraged, with more travel options, plus local shops and services.

Also, increasing the costs could be achieved by reducing the space devoted to cars, with more public transport lanes, wider sidewalks, and pedestrian roads, for example.

Dr. Humberto, one author of the study said: “If our goal is to have more liveable and developed cities then we must take part of this land and give it to other modes of transportation: walking, cycling and public transport.