Each year, the world loses about 10 million hectares of forest—at area about the size of Iceland — because of cutting down trees. At that rate, some scientists predict the world’s forests could disappear in 100 to 200 years. To handle it, now researchers at Massachusetts Institute of Technology (MIT) have pioneered a technique to generate wood-like plant materials sin a lab. This makes it possible to “grow” a wooden product without cutting down trees.

In the lab, the researchers first take cells from the leaves of a young plant. These cells are cultured in liquid medium for two days, then moved to another medium which contains nutrients and two different hormones (激素). By adjusting the bormone levels, the researchers can tune the physical and mechanical qualities of the cells: New the researchers use a 3D printer to shape the cell-based material, and let the shaped material grow in the dark for three months. Finally, the researchers dehydrate (使脱水) the material, and then evaluate its qualities.

They found that lower bormone levels lead to plant materials with more rounded, open cells of lower density (密度), while higher hormone levels contribute to the growth of plant materials with smaller but denser cell structures. Lower or higher density of cell structures makes the plant materials softer or more rigid, helping the materials grow with different wood-like characteristics. What’s more, it’s to be noted that the research process is about 100 times faster than the time it takes for a tree to grow to maturity!

Research of this kind is ground-breaking. “This work demonstrates the great power of a technology,” says lead researcher, Jeffrey Berenstab. “The real opportunity here is to be at its best with what you use and how you use it. This technology can be tuned to meet the requirements you give about shapes, sizes, rigidity, and forms. It enables us to grow’ any wooden product in a way that traditional agricultural methods can’t achieve.”

The Upside to Being Outside

Research shows that being in nature makes people feel good, whether they’re roughing it in the wilderness for days or just hanging out at a local park for a while. One study was conducted in the city of Birmingham, Alabama. Researchers found that most participants’ mood and well-being improved significantly when they spent time in urban parks, even though the average visit was only around half an hour.

    16     For example, scientists in the United Kingdom studied the impact of the “30 Days Wild” campaign. It challenged people to interact with nature for 30 days by enjoying earthy activities like feeding birds and planting flowers. Participants were measurably happier and healthier throughout the challenge…and for months afterwards, too.    17    

How does nature boost people’s happiness? Scientists say that spending time in natural settings reduces stress and anxiety, which benefits mental and physical health. Research shows our brains are more relaxed in natural settings.

To most people, it’s not news that nature can be calming. But multiple studies have found that spending time in nature also has some more surprising benefits, like improving creativity and problem-solving.     18     Another found that exposure to nature helped people score better on tests. That’s more proof that going outside is a smart move!

What accounts for the connection with cognition and creativity? It could be that a good dose of nature acts as a cure to information overload. Everyday life involves a lot of multitasking. Some scientists theorize that spending time in nature enables our brains to rest and recover from mental tiredness.     19    

Naturally, scientific studies don’t cover everything that’s great about the great outdoors.     20     From recreation and exercise to happiness and creativity, there are lots of upsides to getting outside.

Although it is difficult to make direct year-to-year comparisons because of increase in viewing on digital devices, the trend over the past decade is clear in numerous studies, including the Nielsen ratings. The average age of those who watch nationally televised Major League Baseball games has been _____ these years. Asked in a survey whether they _____ baseball, nearly two-thirds of those ages 18 to 36 said no.

Michael Haupert, a professor of economics at the University of Wisconsin ----la Crosse who studies baseball as a business, explains why many young people might be _____ by what to an older and more knowledgeable fan is one of the most exciting experiences in sports: a no-hitter. ” Failure is more ______ than success,” he says. ”If my students get a third of the answers right on their test, they fail. However, if a ballplayer gets a hit a third of the time, he’s often one of the _____ .” But watch an NBA game for 15 seconds, and you will likely see one team score.

It is not surprising that ______ the length of games----about three hours in recent years-----and increasing the pace of action has become a subject of discussion among those who love baseball. MLB commissioner Rob Manfred is strongly ______ of both. For the 2018 season, the league issued a set of new rules designed to do just that. Mound visits are limited. A timer countdown is designed to shorten the break between innings(局).

No one knows if any of these changes will significantly shorten games. According to MLB, the average length of a nine-inning outing this season has been three hours---about five minutes shorter than the 2017 average, itself the longest mean on record.

All of those proposed changes seem to ______ the point. I interviewed at least 100 semi-fans in their late teens and early 20s for my recent book. All considered themselves fans to some degree, though they ______   watched more than snatches—on iPads or smartphones. They told me it made no difference whether a game lasted two or three hours: they would not pay attention for _____ amount of time.

The historic May 14 Supreme Court decision allowing all states to legalize sports betting could have an impact on all this. More people will soon be able to gamble on sports while watching a game on their couch. But whether ______ gambling will attract more young people to baseball is a huge unknown. Many already gamble, both legally and illegally, on fantasy sports, but legalization will provide yet another ______ during games in real time. Will some states allow betting reports in broadcasts? Will it make the young more likely to bet on baseball than on other sports? Stay tuned.

I don’t know what will hook young people on baseball. But abandoning the game’s unique selling proposition---the timelessness that provides both suspense and great conversationhe educated fan -----is not the ______ . Baseball, Clark told me, is like a game of chess---and too many ______ - changes might turn it into something “more similar to a game of checkers.” Baseball may survive in spite of its challenges, precisely because it stands out and stands up against the short ______ spans that negatively affect every aspect of our culture, including politics and education. As Casey Stengel is reported to have said,” Never make predictions, especially about the future. ”