No one knows how much money Dr. Lyle Tullis gave away to students. I was his colleague for nearly a decade and I never stopped being amazed at his generosity. Our college has a program of providing cross-cultural experiences for students. Lots of students take advantage of summer experience oversea. I discovered that no group left for overseas with some of its members receiving financial help from Dr. Tullis.

    It wasn't that he made a lot of money. For one thing, he taught in a church-run school. There, his salary was half of what those people earned in a tax-supported school.

    Other colleagues occasionally complained about the low pay. Not Lyle Tullis. Occasionally some professors would leave our campus for a better-paid position. They told me they did so because, with better pay, they could provide for their families.

    The size of Lyle Tullis' paycheck never seemed to be the most important thing to him. I realized that one day when I was thanking him for helping a student, his eyes shone as he said to me, “I've got so much money that I don't know what to do with it. So, I just give it away.”

    Most people wouldn't have thought that way. Dr. Tullis drove one of the oldest cars on campus. It was even older than almost any of the students' cars. His home, while comfortable, was not fancy at all. But Lyle Tullis lived with the feeling that he had so much money that he needed to give it away.

    He was one of the favorite on campus. Cynics(愤世嫉俗者) might say he bought fame. But they would misunderstand. Lyle wanted to devote his life, all of it, to helping others.

    How can we reduce the risk?

    There are four general approaches to dealing with volcanic dangers. We can try to keep the danger from occurring—often an impossible task. We can try to change its path or reduce its impact on existing development. We can take steps to protect future development. We can also do our best to have disaster response plans in place before they are needed.

    Removing the Threat

    Clearly, there is no way to stop an eruption. We can, however, attempt to reduce the eruption's effects by strengthening structures, for example, building protective works such as walls to make lava (熔岩) flow away from developed areas. Such efforts can be and have been successful, but are of limited use in a large-scale eruption.

    Planning for the Future

    Protecting future development from volcanic dangers is a simple task. Before building houses, we should judge the risk. If the risk seems too great, a safer location should be found. This type of planning is very effective, but all too often, people are drawn to the lush(葱郁的)，rolling land of a quiet volcano.

     Disaster Preparedness (预案)

    When a volcano comes to life, a few weeks may not be enough time to avoid a tragedy. Planning is the key to saving lives. Well before the warning signs occur, people must be educated about volcanic dangers. Escape plans must be in place. Communication between scientists, officials, the media, and the general public should be practiced. Emergency measures must be thought out and agreed upon.

    If you doubt the importance of these efforts, take another look at past volcanic tragedies, such as the eruption of Nevado del Ruiz. Communication failures left the town of Armero unprepared for escape. When a deadly mudflow came down the slope (斜坡), 21,000 people—90 percent of the town's people—died.

    Can dogs and cats live in perfect harmony in the same home? People who are thinking about adopting a dog as a friend for their cats are worried that they will fight. A recent research has found a new recipe of success. According to the study, if the cat is adopted before the dog, and if they are introduced when still young (less than 6 months for cats, a year for dogs), it is highly probable that the two pets will get along swimmingly. Two-thirds of the homes interviewed reported a positive relationship between their cat and dog.

    However, it wasn't all sweetness and light. There was a reported coldness between the cat and dog in 25% of the homes, while aggression and fighting were observed in 10% of the homes. One reason for this is probably that some of their body signals were just opposite. For example, when a cat turns its head away it signals aggression, while a dog doing the same signals submission.

    In homes with cats and dogs living peacefully, researchers observed a surprising behaviour. They are learning how to talk each other's language. It is a surprise that cats can learn how to talk ‘Dog', and dogs can learn how to talk ‘Cat'.

    What's interesting is that both cats and dogs have appeared to develop their intelligence. They can learn how to read each other's body signals, suggesting that the two may have more in common than we previously suspected. Once familiar with each other's presence and body language, cats and dogs can play together, greet each other nose to nose, and enjoy sleeping together on the sofa. They can easily share the same water bowl and in some cases groom (梳理) each other.

    The significance of the research on cats and dogs may go beyond pets ─ to people who don't get along, including neighbors, colleagues at work, and even world superpowers. If cats and dogs can learn to get along, surely people have a good chance.

The ancient Herculaneum scrolls (卷轴)are thought to contain works of important thinkers in ancient Greece. But the scrolls can't be unrolled (打开). Even a light wind threatens to reduce them to dust. The reason is that they were turned into carbon by a natural disaster in A.D. 79.

But now researchers from the University of Kentucky have found a way to look inside the scrolls without having to touch them. They first create a light that is 10 billion times brighter than the sun by taking advantage of a machine. Then they will use the light to go through the Herculaneum scrolls to study and finally read the words recorded on the scrolls. Researchers think it might take them six months to read the scrolls.

This isn't the first time researchers have tried to read the Herculaneum scrolls. Several years ago, scientists from the European Synchrotron Radiation Facility (ESRF) worked on uncovering the mystery using an X-ray beam 100 billion times brighter than anything used in a hospital, This didn't allow scientists to actually read the scrolls, but it allowed them to make one surprising discovery. The scrolls were written in metallic (金属的) ink, a writing technology that scientists didn't know existed at the time the scrolls were penned.

"For a long time, we thought our studies have let us know everything about the ancient ink used to write on scrolls. Now we find it's not the case. This shows that we should tell ourselves it may not be true when thinking we fully know something once some research is done," said Daniel Delattre, one of the study's authors.

The finding wasn't just a historical curiosity. To learn just how special these scrolls are, consider that the thinker Chrysippus in ancient Greece is said to have written over 700 works; but all are lost, with the exception of a few works found in the Herculaneum scrolls. In other words, it's possible that these scrolls represent the only existing complete works left by this great thinker. And who knows what other great works could exist in the scrolls?

Mr. and Mrs. Smith have two children, Kevin and Jenny. The whole family are all busy, so they often leave notes to each other. Here are these four notes of today.

Three grade 11 students from Harbour View High School, Canada, wanted to convey their message of fighting climate change to a younger audience. So, they wrote a children's book named Keeping It Cool as part of a project.

Upon receiving their first order of 12 copies, Claire Malco, the illustrator of the book, vividly recalls the moment when the realization struck. "I just sat there with my mouth open and was like, wow, this is actually happening," Malco told CBC News.

Coauthored by Joanna Jackson and Olivia Jordan, the book employs age-appropriate analogies (类比), coupled with vibrant illustrations, to promote actions kids can take against climate change. To explain the concept of the atmosphere, for example, the young authors drew a bubble(气泡) around Earth throughout the story. They also call for actions, such as planting trees and vegetable gardens – explaining how plants absorb CO2 from the "bubble" atmosphere just like a vacuum cleaner (真空吸尘器). The book also tells kids how they can avoid polluting the bubble by trying to walk, bike or scoot instead of taking a car or bus.

"The entire second half of the book is just things kids can do without needing their parents' support … We wanted it to be something that every kid could finish," Jordan explained to CBC News.

On Earth Day, the students visited a local elementary school where they read their stories and facilitated discussions about the text with every grade 5 class. They spread awareness that, regardless of age, anybody can help make a positive impact on Earth's climate."Educating students was the intention when writing this book. Having the opportunity to present to 10 different classes helped us gain insight on how to better our presentation and content, as well as see the impact this book will have on students," the students told Our Canada Project.