If you are looking for something fun and educational to do in Maryland, why not visit the Maryland Science Center? It is located at 601 Light Street, Baltimore, MD 21230.The ticket prices vary depending on ages, groups and the exhibits you choose.

    Introduction

    The Maryland Science Center is basically a museum, but it gives everyone a chance to learn through experience and play, rather than just glance at an exhibit.

    Activities

    You can learn about various topics, including outer space, the human body, dinosaurs, electricity, marine（海洋的）biology, energy, and much more. You can also take part in the interactive activities, such as racing bubbles, digging for dinosaur fossils, using puzzle pieces to construct cars, and so much more.

    The Davis Planetarium（天文馆）

    At the Davis Planetarium, you can lie back in a chair and look at the stars while still inside the Science Center. The stars will appear on the ceiling of the theatre as you watch them.

    There are different shows to catch at the Davis Planetarium. You can learn about the galaxy and astronomy during the Dark Matters show. Learn about the stars and planets during the Sky Live show. The One World One Sky show allows children to explore the stars. The Live from the Sun show will teach you all about the hot sun.

    The Kids Room

    For children, they can't miss the Kids Room. They will be able to play in a water area, construct dams and water towers, push buttons, ring doorbells, build with blocks, and more, and definitely they will learn a lot. In addition, there is also an area for kids of two years old and under, where they can crawl, walk and explore safely with soft toys.

    Dodder is an unusual and unwanted plant that attacks other plants. Except for its flowers, the plant looks like spaghetti, a kind of noodles in the shape of long thin pieces that look like string when they are cooked. It's almost leafless, thread-like stems (茎) hang down on top of other plants that dodder needs to stay alive. Dodder does not produce its own food. Instead, it steals food from other plants. It feeds by sucking juices from the plant which is wrapped around, often making its host very weak or even killing it.

    Dodder can find other plants by their smell. When a young dodder plant starts growing, it follows the smell of plants it prefers, like tomato plants, potato plants, or other farm crops. Unlike most plants that usually grow in the direction of light or warmth, a dodder plant will grow in the direction of, for example, tomato smell—if a tomato happens to be growing nearby.

    However, a young dodder plant must find a host plant quickly. It no longer needs its root once it is attached to the host and wrapped around it. If it cannot catch a smell of a potential host within a few days, it will dry up and disappear—even if there is plenty of water around. Once it finds a host, the young dodder plant will attach itself to it and start growing faster. At that point the dodder plant will drop its root.

    Dodder is thus a difficult weed to manage and a real headache for farmers. When it does get out of hand, dodder can greatly reduce a farmer's harvest or even destroy crops completely. Before sowing their produce, especially farmers in warm parts of the world often check to make sure no unwanted dodder seeds have mixed with their crop seeds. This is a good way to stop dodder plants from making their way to a crop field secretly.

    A newspaper reporter's job can be very interesting. He meets all types of people and lives quite a busy life. He is on the rush for news all the time, then after several years he may get a desk job, and life becomes a bit more settled. Let's look at his work a little more closely. In a day he may have to interview the prime minister of a foreign country, and the next day he may be writing about a football match. Sometimes he may be so busy that he has hardly any time to sleep. And at other times he may go on for days looking out for news materials yet return empty-handed.

    In the beginning, a reporter has to cover a very wide field. After the early years he becomes more specialized in his work. For example, he may finally be asked to write only on court cases or politics or sports. Some reporters may become so specialized that they are asked only to write on a special thing: horse racing, for example. In most newspaper houses there is at least one special racing correspondent. Some newspapers have book reviews. Their job is delightful. They read the latest book and then write reviews on the ones they like. Then there are those who write on films, so they get to see them even before they are shown in the cinema. How lucky, you would say!

    A reporter's job can also be very dangerous. A number of them have died rushing from one assignment to another, and if there is a flood or a riot(暴) they may get hurt or even be killed. Three years ago there was a reporter whose camera was smashed by a group of men, because they were angry with him for taking their picture. Dangerous or not, one thing is certain, and that is, their job is never dull!

Nowadays Grade Three students are general faced with a lot of pressure,which is rather common.The followed suggestions may help reduce it.First of all,know exactly what lead to your pressure,and then you can take measures to deal with it.Secondly,set up a goal what is not too high—in another words,don't put too much pressure on yourself.Thirdly,finding a way to relax yourself occasionally.For example,you can listen to music,go swim or just simply go walking.Lastly,make friend with others,such as your classmates,your teachers and your parents.They will understand you and come to help you when you are really in the trouble.In word,never get yourself stuck in the pressure for "impossible is nothing".

According to a new Agriculture Department report, U. S. forests could exacerbate global warming because they are being destroyed by natural disasters and are losing their ability to absorb planet-warming gases as they get older. The report predicts that the ability of forests to absorb carbon will start declining after 2025 and that forests could release up to 100 million metric tons of carbon a year as their emissions (排放) from decaying (腐烂的) trees go beyond their carbon absorption. Forests could become a "substantial carbon source" by 2070, the USDA report says.

The loss of carbon absorption is driven in part by natural disasters such as wildfires, tornadoes and hurricanes, which are increasing in frequency and strength as global temperatures rise. The disasters destroy forestland, destroying their ecosystem and decreasing their ability to absorb carbon, according to Lynn Riley, a senior manager of climate science at the American Forest Foundation. Aging forests also contribute. The report found that older, mature trees absorb less carbon than younger trees of the same species, and U. S. forests are rapidly aging.

This trend is likely to continue, as forests come under increasing threat from climate change and exploitation (开采). The typical tropical (热带的) forest may become a carbon source by the 2060s, according to Simon Lewis, professor in the school of geography at Leeds University. "Humans have been lucky so far, as tropical forests are cleaning up lots of our pollution, but they can't keep doing that indefinitely," he said. "We need to cut down fossil fuel emissions before the global carbon cycle starts working against us."

U. S. forests currently absorb 11 percent of U. S. carbon emissions, or 150 million metric tons of carbon a year, equal to the combined emissions from 40 coal power plants, according to the report. The loss of forests as natural carbon absorbers will require the U. S. to cut emissions more rapidly to reach net zero. "As we work to decarbonize (碳减排), forests are one of the greatest tools at our handling. If we were to lose that, it means we will contribute that much more in emissions." Riley said.

In a normal year, Dayna Reber, a business analyst for a technology consulting firm in Camp Hill, Penn., would finish reading around three books. Thanks to the way Covid-19 has completely changed her daily routine, however, Ms. Reber, 30—who now works from home and rarely socializes offline—has polished off 46 volumes so far in 2020. And that count doesn't include the bedtime stories she reads to her 4-year-old.

For Ms. Reber and others, lockdown has brought back a passion for reading, both as beneficial time-filler when stuck at home and as a trusty escape. "When the coronavirus hit, I just felt a need to get away from TV and screens."

If binge (放纵地) reading hasn't fully replaced binge-watching Netflix shows quite yet, the trend is certainly making strides. In August 2020, year-over-year sales of print books in the U.S. were up 13%, according to NPD BookScan, which tracks book sales across the U.S. Publishers also report a notable increase in purchases of e-books, as well as all books about politics or related to civil rights, racism and diversity.

Independent booksellers, as well as publishers and authors, deserve considerable credit for fueling the page-turning trend. In March, Octavia Books introduced free shipping or delivery within New Orleans on orders of $25 or more. The bookstore also hosts author events via Zoom. And in Illinois, Page 1 Books established a subscription service, where customers fill out an online profile, noting their literary tastes, and then receive a package each month, a mix of hardcovers and paperbacks.

Jamie Miller, 34, a book blogger and "book-stagrammer" who lives in Harleysville, Penn, has long been a committed reader, but she says the hobby has meant far more importance this year. She now schedules a block of time every morning to read, typically a love or vivid novel. "Everything became so chaotic around me that it was just like what can I control?" said Ms. Miller. "My brain just wants something guaranteed to be a happy ending."