【推荐1】The earthworm is widely distributed, with 4000 species in the world and more than 300 species in China, where they are in demand as fishing bait, livestock feed, and components of traditional medicine. Known as “ecosystem engineers,” earthworms also play a vital role in the biogeochemical cycle. They can affect the biological, chemical, and physical processes of the ecosystem. In recent years, poachers in China have started using soil electrocution to capture earthworms, putting earthworm populations and ecosystems at risk. In February, China banned the practice.

In the past, earthworms in China were captured manually, which limited the number that could be caught in a short amount of time and did not threaten the earthworm population or the soil ecosystem. In contrast, applying electric current to the soil can catch about 150 kg of earthworms in a day. Removing earthworms at this scale threatens the species with local extinction and robs the targeted ecosystem of the benefits they provide.

This capture method threatens other species as well. The electric current may kill or harm soil organisms beyond earthworms. The changes could disrupt the food cycle or birds, arthropods, and mammals that depend on earthworms as a food source. The sharp decrease of earthworms in the soil may also affect soil fertility and productivity, reducing crop yields.

Electric earthworm capture has quickly become widespread, because earthworms are not included on the list of protected wild animals in China. There have been few legal punishments for using the approach, despite the damage it causes. In February, the Chinese government took a step to ban electric capture of earthworms and other activities that damage the soil ecosystem. However, the financial benefits of large-scale earthworm poaching may provide poachers with an motivation to continue using electric capture despite the ban. To carry out the ban effectively, China should pass laws that specify how poachers will be punished if they continue to use soil electrocution.

【推荐1】During the 15th century, spices (香料) from India were very popular in Europe, however, the only way to travel from Europe to India was over land. This was a long and expensive trip. The King of Portugal realized if he could find a way to get to India by sailing on the ocean, he would become rich by trading spices in Europe. An explorer (探险家) by the name of Bartolomeu Dias had discovered the Cape of Good Hope at the tip of Africa. It was thought that there may be a way around the Cape and to the northeast towards India. However, many were skeptical and thought that the Indian Ocean did not connect with the Atlantic Ocean.

Vasco da Gama, who was born in 1460s to a wealthy Portuguese family in Sines, was given a fleet of ships by the king and told to discover a sea route (路线) around Africa to India. He was also told to look for other trading possibilities along the way.

Vasco da Gama left on his first voyage (航行) from Lisbon, Portugal, with four ships and 170 men on July 8, 1497. Gama and his men rounded the southern tip of Africa at the Cape of Good Hope on November 22. They then headed north up the coast of Africa. They stopped at trading ports along the way including Mombasa and Malindi. At Malindi (about 120 km northeast of Mombasa), they picked up a local pilot who knew the direction to India. With the help of a monsoon wind they were able to cross the Indian Ocean and arrive in Calicut, India in less than a month (on May 20, 1498). At Calicut, Vasco ran into serious trouble when trying to trade. He had brought little of value in his ships. This made the local traders doubtful of him and very soon he had to leave. The voyage back was disastrous. Around half of his men died from scurvy (坏血病) as the trip back took much longer because of the winds not blowing in his favor. However, when he returned home, he was still a hero. He had found the much needed trade route to India.

【推荐2】The concept of planning entire communities before their construction is an ancient one. In fact, one of the earliest such cities on record is Miletus, Greece, which was built in the 4th century BC. Throughout the Middle Ages and the Renaissance various planned communities (both theoretical and actual) were conceived (构思). Leonardo da Vinci designed several cities that were never constructed. Following the Great Fire of London in 1666, the architect Christopher Wren created a new master plan for the city, combining park land and urban space. Several 18th century cities, including Washington D.C., New York City, and St Petersburg, Russia, were built according to comprehensive planning.

One of the most important planned city concepts, the Garden City Movement, arose in the latter part of the 19th century as a reaction to the pollution and crowding of the Industrial Revolution. In 1898, Ebenezer Howard published the book To-Morrow: A Peaceful Path for Real Reform in which he laid out his ideas concerning the creation of new economically sustainable towns. Howard believed that these towns should be limited in size and density, and surrounded with a belt of undeveloped land. The idea gained enough attention and financial backing to lead to the creation of Letchworth, in Hertfordshire, England. This was the first such 'Garden City'. After the First World War, the second town built following Howard's ideas, Welwvn Garden City, was constructed.

In the early 1920s, American architects Clarence Stein and Henry Wright, inspired by Howard's ideas and the success of Letchworth and Welwyn, created the city of Radbum, New Jersey. Conceived as a community which would be safe for children, Radbum was intentionally designed so that the residents would not require automobiles. Several urban planning designs were pioneered at Radbum that would influence later planned communities, including the separation of pedestrians and vehicles, and the use of 'superblocks', each of which shared 23 acres of commonly held parkland.

In America, following the stock market crash of 1929, there was great demand for both affordable housing and employment for workers who had lost their jobs. In direct response to this, in 1935 President Roosevelt created the Resettlement Administration, which brought about a total of three greenbelt towns: Greenbelt, Maryland; Greenhills, Ohio; and Greendale, Wisconsin. These towns contained many of the elements of the Garden City Movement developments, including the use of superblocks and a 'green belt' of undeveloped land surrounding the community.

【推荐1】There are so many different methods claiming to predict marathon performance. But these are not always very accurate because predicting marathon performance is difficult. However, in our new study, we found it's possible to calculate a critical speed that we can use to predict a runner's marathon time with a good degree of accuracy.

Many things determine how fast you can run a marathon, your physical quality plays a huge role in your performance. For example, excellent marathon runners tend to be slim with long limbs. Fast marathon runners also tend to have a higher maximum rate of oxygen use (vo₂ max) and can operate at a high percentage of this maximum for a long time without developing tiredness. The right shoes can make running more economical in terms of how much energy you use. And of course, choosing a flat course with ideal weather conditions can help too.

Endurance (耐久力) running is essentially determined by the fastest speed you can sustain for a given distance. or how long you can run at a given speed. This suggests there is a critical speed which, in theory, we can sustain for quite a long time. It is quite possible that the critical speed is useful for predicting endurance performance.

By analyzing training data from 25,000 athletes, we found we could estimate their critical speeds and predict their marathon performance with 92% accuracy.

We also found that, on average, runners ran the marathon at speeds around 85% of their critical speeds. Faster athletes ran their marathons at close to 93% of their critical speeds, but slower runners did so at 79% of their critical speeds. This means that using training data to estimate your critical speed, certain fitness apps on your smart watch or phone may soon be able to predict your finish time at an even higher degree of accuracy, as well as providing real-time advice about how best to pace your race.