【推荐2】It happens from time to time that after a whole morning of studying,you are tired in the afternoon. It’s then that you might want to eat something sweet, perhaps a chocolate bar to lift your mood. After all, it’s popularly believed that a “sugar rush” gives us energy.

But a study published in Neuroscience& Biobehavioral Reviews suggests that sugar can make us feel worse rather than boost our moods.

The German and UK researchers collected data from 31 studies involving nearly 1, 300 adults. They studied the effect of sugar on various aspects of the mood, including anger, depression and tiredness. They found that people who have too much sugar become more tired within an hour, and that these feelings become more intense (强烈的) over time.

According to the researchers, when people take in sugar, their blood sugar levels rise rapidly, leading to a burst of energy and a short period of feeling good. However, as they begin to digest (消化) the sugar, their blood sugar levels decrease quickly, leading to a bad feeling.

To remain on a “high”, people are likely to eat more and more sugar until they become addicted to it. As with caffeine, this prevents the body from relaxing, leaving people feeling tired.

But the study findings don’t mean we must give up sweet food altogether. According to the World Health Organization, it is healthy to have the sugars found naturally in fruit, vegetables and milk, as long as these make up less than 5 percent of daily total energy intake.

So the next time you feel tired and can’t concentrate, perhaps you should think twice before you bite into a chocolate bar.

【推荐3】Fast food has become indicative of our thoughtless, throwaway society. Yes, it may taste good to some people, but the truth is, it is terrible for health. For those who live in a fast food fantasy world, eating it every day, believing that it is fast, convenient and inexpensive, it can be catastrophic（灾难性的）.

Contrary to being cheap, fast food is very expensive on many levels. To start with, a home-cooked nutritious meal will cost a lot less than any fast food meal and you will know exactly what ingredients are in your food.

However, the expense is not only in terms of the money you spend at the restaurant. There are hidden costs. Not only does it cost money to pay for the petrol to go and get this nutritionally poor food, but also it is very wasteful of paper, plastic and styrene（苯乙烯），all of which do serious damage to the environment: plastic and styrene cannot be got rid of, but break up into small particles（颗粒）and end up in our water supply or our air, and therefore our food chain. It is a very serious circle.

Besides not being good for you, fast food is also addictive（上瘾的）. The more you eat, the more you want, and so, more and more kids are suffering from fatness. Fast food restaurants have become a favorite hangout for teens, and not just for something to eat. If fast food was designed to be quick and easy, why do many of them have cafes, a WiFi zone and an eat-in restaurant？Those are not things a person in a hurry would use. The goal now is trying to attract customers to stay longer and thus spend more money. Their marketing is aimed at attracting kids because they are the ones who have money to spend and are customers of the future.

Fast food is dangerous to your health, hard on your wallet, addictive and harmful to the environment. Through the power of the melia（媒体），children, teens and adults are attracted to “fit in and be cool” ，be part of the fast throwaway lifestyle it promotes. How to resist the hype（促销广告）? Just take a good look at the results on those who eat it. Then look at yourself.

【推荐3】Babies appear to know how to help those in need, according to researchers who studied signs of altruism in almost 100 children. Researchers who wanted to see whether children would give up their food to give it to a stranger without encouragement found the kids just did that — even when they were hungry.

The scientists recruited 96 19-month-old children. During the experiments, a child and a researcher sat across from each other. In the control group, the researcher threw a piece of fruit onto a plate beyond reach, but the child could reach. The researcher showed no expression and made no attempt to get the fruit back. In contrast, the researcher in the test group pretended to accidentally drop the fruit on the plate, and then reach for it unsuccessfully. This signaled to the opposite child that the adult wanted the fruit. Among the test group, 58 percent of the children picked up the fruit and gave it to the adult, compared to 4% in the control group.

Next, the team explored if children would still be generous when the cost was raised. The same scenes as the experiment above were repeated with a separate group of kids before their lunchtime, when they were likely to be hungry. Similarly, 37 percent of the test group handed over the fruit, compared with none in the control group.

The experiments were repeated four times. Researchers got similar results each time. Babies with siblings (兄弟姐妹) and babies from Latino or Asian families shared more of the fruit, the team also found.

Carter Morgan, lead professor of the study, said, “We often think of babies as selfish persons. But here we find that they are willing to help others even when it comes at some ‘cost’ to themselves.” Addressing why children with siblings or from certain cultural backgrounds were more likely to share, Morgan said , “ We believe this partly reflects what social psychologists call ‘interdependence’, which stresses the importance of interpersonal connections. These social experiences that shape attitudes towards sharing appear to have an effect very early in life.”

【推荐2】Cars could soon be communicating with each other using 5G to make drivers aware of upcoming hazards (危险), scientists claim. The extremely fast mobile internet would allow for rapid information transmission and could make drivers aware of black ice, pot holes or other dangers up ahead.

Several car manufacturers are already integrating 5G into their vehicles, including as a tool to help serve in the generation of sel-driving vehicles.

Experts at Glasgow Caledonian University (GCU) believe the high-speed connection will also improve the reliability and capability of automated vehicles to the point where they will be safer than the manual cars being driven today. They predict the number of road traffic accidents, which according to the World Health Organization account for more than 1.3 million deaths and up to 50million people injured worldwide every year, will drop drastically (彻底地) as a result.

Dr Dimitrios Liarokapis, a member of the research group, said, “To have a better idea of what the future will look like, think of having such cars that not only use sensors to scan what's around them, they can also talk to each other and exchange safety-related information about their surroundings over an area that covers several square miles. With the help of 5G, a vehicle-generated early warning system that reminds drivers is possible within the next few years. Cars that are close enough to the danger area will transmit warning messages to other cars around them using short-range communication technologies, but also to cars further away using 5G, fast and reliably.”

A few manufacturers are already working on connected cars. Of them, Ford revealed its intention to fit 80 percent of its 2020 vehicles with technology that warns drivers about upcoming road accidents, bad weather and traffic jams.

【推荐3】It is not easy to become a doctor in the United States. The first step is getting into a medical college. More than one hundred and twenty American schools offer study programs for people wanting to be doctors.

People can get advice about medical schools from many resources. One of these is the Princeton Review. The publication provides information about colleges, study programs and jobs.

The Princeton Review says the competition to enter medical schools is strong. American medical schools have only about sixteen thousand of openings. But more than thirty-two thousand students may try it. Many of those are women.

Most applicants contact more than one medical school. Some contact many. An important part of the application usually is the Medical College Admission Test which is called MCAT. The Association of American Medical Colleges provides the test by computer. It is offered in the United States and other countries.

The people who want to enter medical schools are rated（评定）on reasoning, physical and biological sciences and an example of writing. Applicants for medical schools need to do well on the MCAT. They also need a good record in their college studies.

Some students work for a year or two in a medical or research job before they attempt to enter a medical school.

【推荐1】Many curious children have lately asked “How do glasses help you see?” Actually, they asked this at a very good time because more and more people are needing to wear glasses and we don’t really know why.

Our eyes let us see because light enters each eye, and the eye then creates a message that goes to the brain. The eyeball itself doesn’t actually “see”—the brain sees. The eyeballs just take pictures, like two little cameras. To see properly, each eyeball needs to send the light that enters it into a very exact spot inside the eyeball, called the retina(视网膜). If the light falls onto the incorrect place, everything goes wrong.

Many people won’t need glasses and can see just fine. This is because their eyeballs are focusing light properly onto the retina. However, some people have eyeballs that are too long. They are called “shortsighted”. For these people, things far away can look blurry(模糊的). Other people have eyeballs that are too short. They are called “farsighted” and things close to them can look blurry. Both shortsighted and farsighted people need glasses to help them see clearly. They work by helping the eyeball to focus light onto the correct place, the retina. Only then can we see clearly.

Maybe you have a grandma or grandpa who wears whenever they are reading books or using their mobile phone. When people get older, they usually become a little bit farsighted because a part of their eye called the lens becomes stiff and doesn’t work properly.

More and more young people in the world are needing to wear glasses. we’re not sure why, but some scientists think that children who spend too much time inside are more likely to need glasses. Children who need glasses but don’t wear them don’t do as well as in school. Once you need glasses, you usually need them forever—your eyes won’t go back to normal on their own.

I hope that one day we can find out why people’s eyeballs become too long or too short and then we can stop people needing to wear glasses in the first place. Then people will never lose or forget their glasses ever again!

【推荐2】Homemade Natural Sunscreen

Ingredients

● 1/2 cup olive oil

● 1/4 cup coconut oil with natural SPF (sun protection factor)

● 1/4 cup beeswax

● 2 tablespoons zine oxide (This is a version that won’t be absorbed into the skin. Be careful not to breathe into the powder)

● Optional: up to 1 teaspoon red raspberry seed of

● Optional: up to l teaspoon carrot seed oil

● Optional: up to l teaspoon vitamin E oil

● Optional: essential oils, vanilla extractor other natural extracts to suit your preference

Instructions

Combine ingredients except zine oxide in a larger glass jar. I have a mason jar (see Fig. 1) that I keep just for making lotions and lotion bars, or you can even reuse a glass jar from foods.

Fill a medium saucepan with a couple inches of water and place over medium heat.

Put a lid on the jar loosely and place in the pan with the water.

As the water heats, the ingredients in the jar will start to melt. Shake or stir occasionally to mix. When all ingredients are completely melted, add the zine oxide, stir in well and pour into whatever jar on tin you will use for storage. Small mason jars are great for this. It will not pump well in a lotion pump!

Store in a cool dry place or in the fridge.

Use you use regular sunscreen. Best if used within six months.

Additional Notes:

● Beeswax is for water protection. This sunscreen is somewhat, but not completely, waterproof and will need to be reapplied after sweating or swimming.

● Make sure not to breathe in the zine oxide — use a mask if necessary!

● This recipe has an SPF of about 15, though adding more zine oxide will increase the SPF.

● Add more beeswax to make thicker sunscreen, less to make smooth sunscreen.

● I recommend coco mt or vanilla extract for sweet smell.

● I prefer to store in a small can nig jar and apply like a body butter. It will be thicker, especially if you use coconut oil in the recipe.

● Remove the zine oxide and this makes an excellent lotion recipe!

【推荐3】Jerome H.Powell,the Federal Reserve chair, suggested on Wednesday that improved child care support policies from the government might help pull more women into the labor market.

“Our peers, our competitors, advanced economy western countries, have a more built-up function for child care, and they wind up having much higher labor force participation for women,” Mr. Powell said, “We used to lead the world in female labor force participation, a quarter-century ago, and we no longer do. ”

But Mr.Powell did voice qualified support for a few broader ideas. He made it clear that the labor market remained far from healed, that the pandemic's economic outcome has largely hurt women and minorities since the winter of 2020, and that both Congress and the central bank have a role to play in supporting working-class families until the economy has recovered more fully. As Mr. Powell implied, adult women in the United States hold jobs or look for them at lower rates than women in some other major advanced economies, such as Canada or Germany.

Research has suggested that the change may be linked to child care policies. In a 2018 paper that asked why the share of Canadians who work or look for jobs had climbed even as United States labor force attachment had fallen, researchers at the Federal Reserve Bank of San Francisco pointed out that most of the gap owed to different outcomes for women.And they pointed to caregiving policy differences as a likely reason.

“Parental leave policies in Canada provide strong motivation to remain attached to the labor force following the arrival of a new child," the paper, written by the San Francisco Fed president,Mary C. Daly,and co-authors,pointed out.“The contrast between the motivations Canada and the United States offer prime-age workers to remain attached to the labor force is clear.”

The fact that child care responsibilities fall heavily on women in the United States has come under a brighter spotlight during the pandemic, which has shuttered schools and disproportionately left women bearing added child care responsibilities during the traditional workday.