Over the last five months, local and regional competitions have been held across Kenya for Maasai men of"warrior（勇士）"age. They are part of the Maasai Olympics, which have been held every two years since 2012. These men compete in six events: 5,000m, 800m, 200m, high jump, javelin and the rungu（a wooden throwing club） throw. There are also two events for women: 1,500m and 100m.

December 15,2018 marked the final round with crowds gathering in Kimana, near the Amboseli National Park, about 200 km south of Nairobi（the capital of Kenya）. Different kinds of medals are among the prizes for the winning individuals and communities.

International charity Born Free, a main sponsor of the events, helped to offer Maasai warriors an alterative to killing lions as part of their traditional ceremony. It was the brainchild of the wildlife charity Big Life Foundation and eight Maasai elders who wanted to"stop lion hunting by our warriors once and for all, making it a cultural taboo（禁忌）."

"As human populations grow, and our wants seem to increase—with little sympathy for those other species with whom we share the planet—the pressing need for co-existence, and examples of how this may be achieved. are few and far between," said Born Free's CEO Howard Jones.

"The Maasai have a 500-year-old tradition of hunting lions to prove the courage of young men. As a result, an estimated 2,000 lions now remain in Kenya. The Maasai live and work alongside these creatures, so they are expected to play a key role in their protection and conservation," added Jones.

The Maasai Olympics were developed to encourage young men to compete in an organized sports completion based on their traditional warrior skills. As well as the competitive element, the events also aim to educate local people about conserving lions and wildlife, and the importance of human-wildlife co-existence and tolerance.

Lego is considering a brick rental scheme in an attempt to cut down on plastic waste. The Danish toymaker has promised to make all its bricks from sustainable sources by 2030 and is searching significant resources into finding alternatives.

Tim Brooks, vice-president responsible for sustainability, said the company was "totally open" to the idea of a product rental scheme but acknowledged that lost pieces could be a significant problem. He said the rental scheme was "possible" but admitted there were some "technical barriers", one of which is the complexity of some Lego sets, many of which contain thousands of pieces. "What are the chances of giving them to an eight-year-old child and getting them all back again?" Mr. Brooks added.

Lego has come under increasing pressure to reduce its carbon footprint with growing international alarm about the impact of plastic waste on the environment. Lego reportedly gives off around a million tons of carbon dioxide each year, with about three-quarters coming from raw materials that go into factories. It produces 19 billion pieces per year -36, 000 a minute - that are made of plastic and much of the inner packaging is also plastic.

So far, the only breakthrough has been the development of a line of bricks made from plant-based plastic sourced from sugarcane(甘蔗). The green trees, plants and flowers were first included in Lego sets late last year but account for only one-two percent of the total amount of plastic elements produced.

Henrik Ostergaard Nielson, a production administrator in Lego's factory, told the New York Times last year, "We need to learn again how to do this. " The company has invested more than €100, 000, 000and hired 100 people to research non-plastic alternatives. It is aiming to keep all of its packaging reusable by 2025.

Using the health records of more than a million Swedish conscripts (应征入伍者), a recent study revealed that keeping cardiorespiratory (心肺的) fitness in their late teens and early twenties can cut the risk of developing nine types of cancer by 40% when older. The research team from the University of Gothenburg, Sweden said, "These results could be used to further strengthen the promotion of interventions aimed at increasing fitness in youth."

Almost a third of people aged from 16 to 24 in England aren't physically active, without meeting guidelines of at least 150 minutes of moderate physical activity a week including walking, riding a bike and dancing.

Cardiorespiratory fitness (CRF) measures how well the heart, lungs and linked systems work to get oxygen to muscles during constant activities. The conscripts, aged between 16 and 25, had tests of CRF on exercise bikes between 1968 and 2005. The researchers used Swedish health data to see who went on to have cancer during an average follow-up of 33 years. The study found that increasing fitness was beneficial, regardless of body weight. However, they also found that higher fitness was linked to a higher risk of skin cancer. The researchers explained that this trend might be driven by exposure to sunlight.

Findings from those observational studies provide much evidence for a link between higher levels of physical activity and a lower risk of cancer. However, these studies cannot fully rule out the possibility that active people have lower cancer risk because they engage in other lifestyle behaviors. The researchers cautioned that they had no access to full data on factors such as diet, alcohol intake and smoking and so couldn't fully account for those.

Dr Claire Knight, of Cancer Research UK, said, "The NHS recommends 150 minutes of activity a week, but it's fine to build up activity over time and there are lots of ways to be more active. You don't need to run a marathon or join a gym. Anything that gets you warmer and slightly out of breath and your heart beating faster counts."