Today, many people use plants from other places to design their yards. Well, do they have any influence on animals living nearby? As we know, plants supply food for things like insects and plant-eating animals. In turn, birds and meat-eating animals feed on these insects and plant-eating animals. It is easy to see how important plants are.

    Although foreign plants may look beautiful, they can cause problems when there are too many of them. I live in Virginia, USA, and sometimes see a plant—commonly known as Kudzu—that seems to cover everything in the area, even climbing over whole trees and houses.

    Kudzu is an unbelievable plant since it grows very fast. It was first brought to the United States from south-east Asia around the 1870's as a crop that farmers could grow. However, Kudzu quickly came to be considered harmful throughout the southern United States.

    Since Kudzu grows fast in many different environments, it can completely cover areas of land quickly. The plant is also not eaten by any insects or birds in the United States so it can grow unchecked. Kudzu can cover trees, bushes, and even houses. It costs the United States 500 million dollars a year to just keep Kudzu from growing too fast. The plant is a perfect example of what scientists call an invasive (侵略性的) species, which grows more quickly than other native plants.

    All foreign plants have the possibility to spread quickly. Not only are they costly, but planting them in gardens actually takes away food from insects. If everyone filled their garden with plants native to where they live, many lovely butterflies and other native creatures would be attracted to their backyards! So, take a look out of your window — how does your garden grow?

    Ask someone what they have done to help the environment recently and they will almost certainly mention recycling. Recycling in the home is very important of course. However, being forced to recycle often means we already have more material than we need. We are dealing with the results of that over-consumption in the greenest way possible, but it would be far better if we did not need to bring so much material home in the first place.

    The total amount of packaging increased by 12% between 1999 and 2005. It now makes up a third of a typical household's waste in the UK. In many supermarkets nowadays food items are packaged twice with plastic and cardboard.

    Too much packaging is doing serious damage to the environment. The UK, for example, is running out of it for carrying this unnecessary waste. If such packaging is burnt, it gives off greenhouse gases which go on to cause the greenhouse effect. Recycling helps, but the process itself uses energy. The solution is not to produce such items in the first place. Food waste is a serious problem, too. Too many supermarkets encourage customers to buy more than they need. However, a few of them are coming round to the idea that this cannot continue, encouraging customers to reuse their plastic bags, for example.

    But this is not just about supermarkets. It is about all of us. We have learned to associate packaging with quality. We have learned to think that something unpackaged is of poor quality. This is especially true of food. But it also applies to a wide range of consumer products, which often have far more packaging than necessary.

    There are signs of hope. As more of us recycle, we are beginning to realize just how much unnecessary material we are collecting. We need to face the wastefulness of our consumer culture, but we have a mountain to climb.

    "Cleverness is a gift while kindness is a choice. Gifts are easy – they're given after all. Choices can be hard." –– Jeff Bezos.

    I got the idea to start Amazon 16 years ago. I came across the fact that the Internet usage was growing at 2,300 percent per year. I'd never seen or heard of anything that grew that fast, and the idea of building an online bookstore with millions of titles was very exciting to me. I had just turned 30 years old, and I'd been married for a year. I told my wife MacKenzie that I wanted to quit my job and go to do this crazy thing that probably wouldn't work since most start-ups don't, and I wasn't sure what to expect. MacKenzie told me I should go for it. As a young boy, I'd been a garage inventor. I'd always wanted to be an inventor, and she wanted me to follow my passion.

    I was working at a financial firm in New York City with a bunch of very smart people, and I had a brilliant boss that I much admired. I went to my boss and told him I wanted to start a company selling books on the Internet. He took me on a long walk in Central Park, listened carefully to me, and finally said, "That sounds like a really good idea, but it would be an even better idea for someone who didn't already have a good job." That logic made some sense to me, and he persuaded me to think about it for 48 hours before making a final decision. Seen in that light, it really was a difficult choice, but finally, I decided I had to give it a shot. I didn't think I'd regret trying and failing. And I believed I would always be haunted(萦绕)by a decision to not try at all.

    After much consideration, I took the less safe path to follow my passion, and I'm proud of that choice. For all of us, in the end, we are our choices.

Have you ever heard of invisible ink? You may have seen it in movies. When light is shone on the paper which invisible ink is written on, you can read it!

As magical as this seems, the change in color is due to science. The ink is absorbing higher energy light and giving lower energy light. This reaction is an example of fluorescence (荧光) .

Light is a very broad term that describes a range of electromagnetic rays, including gamma rays, infrared light (红外光) and ultraviolet light. One part of the electromagnetic visible light is the colors that we can see with the human eye. These rays travel in curvy lines and each type of the ray is characterized by a different wave pattern. For example, Gamma rays have a shorter wavelength than infrared light. Shorter wavelength is connected with higher energy, so gamma rays also have more energy than infrared light.

Corals (珊瑚) are animals that live underwater. And the corals in the Red Sea exhibit fluorescence. Why is this happening? Scientists have shown that fluorescent objects absorb higher energy light and release lower energy light. Since the corals of the Red Sea are deep in the water where there is very little visible light, scientists theorize that these corals absorb ultraviolet light and produce visible light. They have special photo proteins, which enable them to change invisible light to visible light.

Fluorescence is not just used to create pretty colors. Corals have developed photo proteins for a biological reason. The visible light is used by algae (海藻) , which are eaten by the coral, to make food through photosynthesis (光合作用). The visual character of these photo proteins could also be used for biomedical research. They can highlight cells and cell structures under a microscope.

Isn't it amazing that a simple organism that we don't think very much of is not only grand but could also have so many potential uses in medical research!

Sleep is essential for a person's well-being. Researchers have found that sleep loss increases a person's risk of developing serious medical conditions. Now, a new study has found that getting enough sleep is also the key to improving academic performance.

Jeffrey Grossman, who led the research, was not trying to find the correlation(相关性) between sleep and grades when he handed out a device to the students in his class. Instead, the professor hoped the popular wrist-worn electronic device, which tracks a person's activity 24/7, would show a connection between physical exercise and academic achievement.

As part of the research, a quarter of the participants chose a fitness class specially created for the study. After the school term ended, the researchers carefully analysed the data. Much to Grossman's surprise, they found no measurable difference in test performance between the group that had been physically active and the group that had not.

However, the study presented a surprising viewpoint in the journal Science of Learning. Going through the large amount of data, Grossman noticed an interesting trend(趋势) from the participants' sleep patterns. There was a straight-line relationship between the average amount of sleep and his/her grade in the exams.

Besides, it was not enough for students to just head to bed early the night before a test. Grossman says, "We've heard the phrase ‘Get a good night's sleep. You've got a big day tomorrow.' It turns out this does not relate at all to test performance. Instead, it's the sleep you get during the days when learning is happening that matters most."

The time when students went to bed each night was similarly important. Those who went to bed in the early hours of the morning performed poorly, even if the total sleep time was the same as a higher-performing student.

The research does not prove that sleep is the only component that helps improve academic performance. However, Grossman says the results are a strong indication that sleep really matters. Who knew getting A's just required some extra ZZZ's?

Graduating is indeed a momentous occasion that calls for a memorable celebration. Here are some destinations that could make your post-graduation vacation truly special:

Iceland

Why Go: Iceland is a land of dramatic landscapes and natural wonders. The chance to witness the ethereal beauty of the northern lights, explore geothermal pools, and admire the majesty of waterfalls makes it a unique destination.

What to Do: Beyond Reykjavik, venture into the countryside to experience the solitude and beauty of the Icelandic wilderness. Consider a road trip to chase waterfalls, explore geysers, and soak in hot springs.

Budget Consideration: While Iceland can be pricey, the experience of its otherworldly landscapes is often considered worth the investment.

Florence, Italy

Why Go: Florence is a city steeped in history and art, offering a rich cultural experience that can be both intellectually stimulating and emotionally satisfying.

What to Do: Visit the Uffizi Gallery to see masterpieces like Botticelli's "The Birth of Venus," stroll through the Boboli Gardens, and enjoy leisurely dinners in the piazzas. Climbing the Duomo for a panoramic view of the city is also a must.

Budget Consideration: While Florence can be costly, the cultural richness and historical significance make it a worthwhile destination for a graduation trip.

Greece

Why Go: Greece is known for its idyllic islands, ancient history, and vibrant culture. It offers a perfect blend of relaxation and exploration.

What to Do: Visit the Acropolis Museum in Athens to delve into the origins of Western civilization, enjoy the sun and sea on the Greek islands, and indulge in the local cuisine.

Pro Tip: Don't overlook Athens. It's not just the capital but also the cradle of Western thought, making it a fitting place to reflect on your educational journey.

Vietnam

Why Go: Vietnam offers a budget-friendly and immersive experience, allowing you to step out of your comfort zone and explore a different culture.

What to Do: Navigate the bustling streets of Hanoi, enjoy local delicacies like pho, and embark on a boat trip through the stunning Halong Bay.

Budget Consideration: Vietnam is an affordable destination that offers a rich cultural experience without breaking the bank.

Each of these destinations offers a unique experience that can help you mark the end of one chapter and the beginning of another in your life. Whether you're drawn to the natural beauty of Iceland, the historical richness of Florence and Greece, or the cultural immersion of Vietnam, your graduation trip can be a celebration of your achievements and an adventure into the unknown.