【推荐3】The public nowadays has a misunderstanding of forest fires, believing that fires should be kept out of every type of forest. Many of us can recall Smokey the Bear’s famous warning: “Remember, only YOU can prevent forest fires”. However, that’s not always the case. Under the right conditions, and when conducted safely, fire can create many environmental benefits as well as help prevent larger, uncontrollable wildfires.

After a forest fire, many wildlife species will move into recently burned areas to feed on these newly available foods. Some reptiles and amphibians such as the pine snake prefer forests frequently burned by fire. As Herbert Stoddard put it, “One of the most harmful things modern man has done to birds has been his attempt to exclude fire from fire-type pine (松树) forests. Within a few years most forests choke up with bushes, lose their prairie-like vegetation (草原般植被) and can no longer support birds dependent on periodic burning for their food supply and proper cover.”

If you are asked to picture the forest floor, what do you see? Pine needles, cones, leaves, branches might come to mind — all sources of fuel. If these fuel sources build up without any type of removal, the ‘fuel load’ can lead to fires catastrophic to forests and people alike. In contrast, prescribed fire can be used by forest professionals every couple of years to keep forest fuels at an appropriate and manageable level. They can also minimize the spread of pest insects and disease and remove unwanted tree and plant species. Plus, they can create and maintain important wildlife habitats rich in grasses and promote the growth of trees, wildflowers and other various plants.

Many organizations and agencies work to promote fire on the landscape when and where appropriate. Smoky Bear even has an updated warning: “Only You can Prevent Wildfires,” as the Forest Service has over the last few decades developed policies and procedures to include prescribed fire as a management tool, as well as continuing their work to prevent and fight wildfires.

【推荐2】To learn an instrument(乐器) such as the violin or accordion(手风琴)takes years. There are fewer job opportunities and greater competition. Then why are more people than ever before paying a lot of good money to get their children the best music teaching they can afford?

The secret lies in the effect of music on the whole person. It has been found that learning a musical instrument actually increases a person’s IQ over time. Different instruments and different types of music have varying effect, with classical music and the string(弦乐) family coming out on top, potentially increasing your IQ by up to 12 points!

When is a good time to start learning music? Experts have found that even the fetus(胎儿)can benefit from listening to classical music. Surround yourself and your family with good music from the first. The Suzuki Piano Method teaches children from the age of 3 years piano, with two lessons per week. From preschool, children can learn to read music and play from sheet music. Progress in learning your instrument is directly proportional(成比例的)to the amount of practicing.

Is there such a thing as an unmusical child? Shinichi Suzuki says that music is the native home language of all human beings and therefore nobody can be “unmusical”. Of course there are exceptional talents, compared to which others may seem to be slower learners.

Is there any benefit for adults in starting an instrument? Apart from the purely relaxing aspect, yes. Learning an instrument can earn even adults additional IQ points, and as an added benefit in improves your health by reducing your stress levels. Your social life may benefit too, if you are prepared to come out of your box and join occasions such as Ceilidhs (musical get-togethers) or arrange house concerts. It is believed that people who play instruments tend to be more emotionally balanced(平衡) and more patient with themselves, others and life in general.

So go ahead, sign up for that amateur orchestra(业余乐队), dust off your old trombone(长号)or take your first real six-string down from the attic(阁楼); get out there and play!

【推荐3】In order to survive trips to Mars, humans need oxygen. Now, a team of scientists has designed a robot that could extract oxygen from water on the Red Planet.

The robot, which is called “AI chemist”, used a machine learning model to find a compound that could ignite an oxygen-producing chemical reaction on Mars. The compound, known as a catalyst (催化剂), is made entirely from elements found in Martian meteorites (陨石) — which means, if such a system could work reliably, space travelers would not need to bring oxygen or even the catalyst needed to produce it.

Mars’ atmosphere contains only trace amounts of oxygen. But scientists have detected evidence of liquid water beneath the planet’s southern ice cap. To create the breathable gas, researchers wanted to find a way to break down this water into its hydrogen and oxygen molecules using materials found on Mars.

Their robot analyzed five meteorites that either came from Mars or had a composition similar to that of the Martian surface. Using a laser, it identified significant amounts of iron, nickel, calcium, magnesium, aluminum and manganese in the samples. From these six elements, the robot’s algorithm (算法) deter-mined it could produce more than 3.7 million possible molecules to break down water and form oxygen on Mars. According to the researchers, finding the best one from this extensive list would take roughly 2,000 years of human labor, but for the AI chemist, it took only weeks.

“On the Earth, we don’t use these six elements,” Yi Luo, a co-author of the study says. “They are not the best choices for catalysts, but it’s only what you’ve got on Mars.”

With its chosen catalyst, the system could produce oxygen from the Martian materials at around - 37℃, demonstrating the chemical reaction could be possible on the cold Martian surface.

Notably, the robot was able to carry out the entire process — analyzing the rock samples, identifying the Jest possible catalyst and producing it without human intervention.