【推荐2】Despite the fact that burgers, chips and fries are known as some of the most unhealthy food we can eat, they are still the most popular food.

There are a few reasons behind that. First, junk food is generally easy to get and take with you. This convenience is a major draw for many, especially people who are always on the go. Restaurants like McDonald’s and KFC can be found outside many schools and workplaces, providing meals in under a minute.

Secondly, junk food contains a lot of added sugar and fat. This kind of food causes our brain to send out certain chemicals, which produce the feeling of relaxation, pleasure and enjoyment. That’s why such food is called “comfort food”.

Thirdly, our ancestors didn’t have such easy access to the huge variety of food we come across every day. They didn’t have the convenience of having food as easily as we do. So they made it a habit to eat as much as they could to survive and protect themselves from the hard natural conditions. The cave mentality (心理) is passed down to us, which makes us believe that we can never have enough food that is high in sugar and fat, no matter how crazily we eat.

Besides, when we are too worried and tired to relax, our body produces cortisol (皮质醇), which increases the sugar content in the blood, so it can be used as energy to aid in fat and carbohydrate metabolism (碳水化合物代谢). Additionally, it is also found to increase hunger. That’s the reason why when we’re thinking about unpleasant things, we prefer foods that are high in sugar, fat and carbohydrate, that is to say unhealthy food.

【推荐3】Some educators are trying to engage(吸引) students’ attention with technology, such as educational videos, computer gaming and AI just to name a few. But using these methods in the classroom can be very challenging. Teachers using these tools often struggle to keep students focusing on the materials, competing with the latest social media, and can feel limited by using them to get some knowledge across. Graphic novels(图画小说) offering visual information married with text provide a means to engage students in the classroom.

Educators have used this method in their teaching. For example, instead of filling out problem sheets, students in a math class were asked to read a mystery called Who Killed Professor X? In this story, all of the suspects(嫌疑人)are famous mathematicians. As they tried to figure out the connections between the suspects, students often forgot that they were doing math focusing instead of finding secret details to solve the problem. Although this is just one experience for these students, it improves their confidence and shows them how math can be fun.

Jason Ho, an assistant professor at Dordt University, uses Max the Demon Vs Entropy of Doom to teach his physics students about a topic. This topic can be particularly difficult for some students because they can’t physically touch something. Ho said graphic novels can create an engaging learning environment, and most of his students now understand the subject by getting clear explanations for some ideas.

Although the Internet offers a lot of math and physics resources, it can be tiring to search through many hours of videos to find the perfect one to get the “aha!” moment in learning. Graphic novels provide a staring point with a wide range of topics. Want to learn about programming? Try the Secret Coders series. Need more female role models in science? Astronauts: Women on the Final Frontier could be just what you're looking for.

With all that graphic novels offered, we believe that the right set of graphic novels can inspire future scientists as much as any single person can.

【推荐2】Over the last half century, obesity (肥胖症) rates have skyrocketed. In 1962, 46 percent of adults in the US were considered overweight. By 2010, that figure had jumped to 75 percent.

Obesity is a complex problem with many causes. But among the likely suspects, sugar is high on the list. A variety of research has drawn a link (联系) between sugar consumption (消耗) and overweight. As sugar consumption has increased, so has our waistline.

“I don’t think we have enough evidence yet to suggest that sugar is the reason for obesity,” says Johns Hopkins, a cardiologist. “But there is enough evidence to say that too much sugar consumption is an important contributor to weight gain.”

All those sweet snacks seem to be affecting the heart as well. In a study published in JAMA: Internal Medicine in 2014, researchers compared people who consumed a lot of added sugar accounting for 17 to 21 percent of their total daily calories with people who ate less sugar — just 8 percent of their total calories. Those in the high-sugar group had a 38 percent greater risk of dying from heart disease.

Excess weight increases the risk of many diseases like high blood pressure, high cholesterol and Type 2 diabetes. Research by the team of Ndumele has shown that those factors usually explain the link between obesity and heart disease. “All of those factors make it more likely that someone will develop heart disease,” says Ndumele.

In other words, there are many reasons to aim for a healthy weight. And cutting back on sugar is a good place to start.

【推荐3】A sense that life has meaning doesn’t just offer philosophical benefit; it’s also tied to improved physical and mental health. What factors, apart from close relationships and personal accomplishments, foster (培养) a belief in a meaningful life? Three recent studies highlight some potential mechanisms of meaning.

What really matters? Researchers who study meaning in life have broken the concept into three aspects: coherence (the feeling that life makes sense), purpose (having and working toward goals), and mattering (the sense that one’s life has value and makes a difference). University of Sussex psychologist Vlad Costin argues the last factor, mattering, may be the most crucial.

In three experiments, participants’ sense of mattering most reliably predicted whether they saw life as meaningful one month later. Though it wasn’t known why participants felt their lives mattered, Costin thinks that it could have resulted from their contributing to others.

What’s the golden age of life? Confidence in life’s meaningfulness may be greatest around age 60, on average, a recent study suggests. Using data from 1,042 U.S. adults, University of California, San Diego, researchers found that the presence of meaning in life followed a curve (曲线) over the lifespan (寿命), reaching its peak at approximately 60 before declining again. The search for meaning, on the other hand, followed the opposite track, reaching a low point at 60 before climbing. Regardless of age, physical and mental well-being were both strongly correlated with a belief in life’s meaning.

Many seek meaning through extraordinary experiences-but they may also find it in ordinary, daily acts. New research found that a preference for routines was correlated with a greater sense of meaning. Students tracked for a week reported somewhat greater meaning, on average, when engaging in everyday acts such as studying or working-perhaps, the authors note, because routines build a coherent sense of self. Study co-author and Rutgers University psychologist Samantha Heintzelman observes: “Moments that make sense and feel right can make life meaningful, too.”