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    Lucy, whose skeleton（骨骼） was discovered in Ethiopia in 1974, died shortly after she fell out of a tree, according to a new study published Monday in the British journal Nature.

    For their research, Kappelman and Dr. Richard Ketcham used a CT scanner to create more than 35,000 "slices" of Lucy's skeleton. Scientists named her Lucy from the Beatles song "Lucy in the Sky with Diamonds", which was played at the camp the night of her discovery.

    The following analysis of the slices showed sharp, clean breaks seen at the end of Lucy's right humerus （肱骨） are similar to bone breaks seen in victims of falls.

    The researchers concluded that these and other breaks in her skeleton show that Lucy, who is believed to have stood about 3 feet 6 inches and weighed about 60 pounds, fell feet first and used her arms to support herself﹣but that the injury was too severe to have been survivable.

    The researchers estimate that Lucy was going about 35 miles an hour when she hit the ground after falling from a height of roughly 40 feet, according to the statement.

    That sounds plausible. But other scientists are doubtful. "There are countless explanations for bone breaks," Dr, Donald C, Johanson, director of the Institute of Human Origins and one of the scientists who discovered Lucy, said, "The suggestion that she fell out of a tree is largely a just﹣so story and therefore unprovable." Johanson said it was more likely that Lucy's breaks occurred long after she died, saying that "elephant bones appear to have the same kind of breaks, It's unlikely they fell out of a tree.

    But the new research focused on "a small number of breaks" that are consistent with "high﹣energy bone﹣to﹣bone influences" and which differ from the sorts of breaks commonly seen in other collected bones. Kappelman responded in an email, "These appear to have occurred at or near the time of death."

    A video of a three-year-old girl being kicked by her own mother during a photo shot went viral (疯狂传播) on Thursday, indicating China's under per forma nee in regulating the emerging child modeling industry.

    The girl, known as Niu Niu, was physically abused by her mother in several videos. The videos have annoyed Chinese media and Internet users alike. Many netizens and scholars call for local authorities to carry out further investigations into possible child abuse.

    In response to the public outcry (强烈抗议), Niu Niu's mother issued an apology via Sina Wei bo on Thursday, condemning accusations of abuse. She noted that she was merely guiding her daughter for better shots and the girl is well looked after.

    Despite her apology, many E-shops which used Niu Niu's images for brand promotion have canceled their cooperation with the mother, while over 110 well-known child garment shops on Taobao have signed up for a campaign to provide better protection for child models.

    "It is necessary to adopt comprehensive laws and regulations to further protect the kids, preventing their parents and companies from exploiting (利用) them," Fang Zhiqing, a lawyer and child protection expert, said.

    Niu Niu is not alone. In Zhili, a small town in Zhejiang province, thousands of children from across China are taken here by their parents to seize the chance of fame. With a population of 450,000. Zhili has over 13,000 manufacturers of child clothing. In 2017, the town earned over 7 billion yuan by selling do thing for children online, thus providing opportunities for child models.

    "China's current advertisement law isn't workable when it comes to the industry of child modeling, as it lacks clear supervision measures and clear legal punishment." Fang added. "It is important to issue new laws which regulate child modeling."

    People in Japan tend to live longer and stay healthier in their later years, with an increasing number of old people living alone. Japan is on a fast track to "ultra-age" with people aged 65 or above accounting for 28 percent of its total population in 2019；it was 26.7 percent in 2017. On the other hand, the number of births in 2019 fell to its lowest (about 941,000) since records began in 1899.

    Demand for care services for elderly people has increased. A shrinking (缩小) working population means fewer able-bodied adults are available to look after the elderly. State-provided facilities for the elderly are not enough which causes elderly people to turn to private ones but they are expensive.

    The country will be short of 380,000 of health nurses by 2025. The government has to turn to advanced robots to meet the shortage. A study found that using robots encouraged one third of the people to become more active and independent. Yet there is no robot that can provide the emotional support to the elderly.

    Japan provides a case study for China, which is also faced with a fast aging population. 17.23 million babies were born in China in 2019, about 630,000 fewer than in 2018. People aged 60 accounted for 17.3 of China's population in 2019. With a shortage of elderly care facilities and unbalanced supply, China may find it hard to deal with the rapidly increasing number of senior citizens.

    To meet the challenge, the Chinese government should make policy changes, which Japan is unwilling or unable to do or even consider. China should pay attention to the signals its aging population is sending and take proper and timely action.

Do you continue to be healthy in social isolation? NASA is looking for people to spend 8 months locked in a Russian lab for a new experiment.

When humans go to the moon and travel to Mars, they will need to be prepared for long-term space travel and even longer stays on these far-off destinations. Currently, NASA's Artemis program aims to land humans on the moon for the first time since NASA's Apollo 17 mission landed in 1972.

While the moon is the main goal of NASA's Artemis program, the agency's larger goal is to send people to Mars. But long-term space travel and habitation won't be easy. Such missions will present both physical and mental challenges as astronauts work to not only survive, but perform important scientific research in uniquely difficult environments.

In the upcoming NASA-Russia experiment, a group of people will live in a closed facility at Russia's Institute for Biomedical Problems, which is in Moscow. This habitat facility was used in2011 for notable series of Russian mock (模拟的) Mars missions known as Mars 500. During these missions, groups of people spent 520 and 105 days on two separate missions in the facility.

The facility, according to the statement, will have "environmental factors similar to those astronauts are expected to experience on future missions to Mars". The group of people will spend 8 months living together in isolation and working on scientific research.

By living and working in this Mars-like environment, participants in this study will help NASA researchers better understand the psychological and physiological (心理和生理的) effects of isolation. These missions help researchers not only perform relevant science experiments but also see how people might get on under strange conditions for long periods of time.

So, if you're finding that living in social isolation works for you, you might be particularly well-suited for living in a Mars-like environment and this could be for you. But first, you have to qualify. NASA is looking for "highly motivated" Americans between the ages of 30-55, who must speak both Russian and English fluently and have a Master of Science, Doctor of Philosophy, Doctor of Medicine, or military officer training. Applicants with other related experience may also be considered. Those who are chosen to be a part of this group will be paid for their work.