My parents moved to Mississippi when my brother and I were small children, and we were separated from our Oklahoma grandparents by some 600 miles. This long distance allowed us to only visit our grandparents once a year, either at Christmas or during summer vacation.

    Most of my classmates lived near their grandparents, and I would often hear stories of big families regularly spending time with one another, fishing at “grandpa's” house or going over to “grandma's”for her famous fried chicken. We were disappointed that we did not get to spend more time with our grandparents, but our love for them remained deep and strong.

    We always expected a road trip to Oklahoma. We would count the days, and when the day came, the entire family would pile into our car at four o'clock in the morning. Crossing the Mississippi River into Louisiana, the scenery changed. Crossing the Red River in Oklahoma, we were in a foreign world.

    Every trip to see my grandparents can't be without bringing delight. We jumped out of the car in their driveway to be met with bear hugs. My grandparents wanted to know everything about their grandchildren, and we would sit for hours and tell story after story. Grandma had a meal planned, and you could guess she prepared her grandsons' favorite foods. Of course the best part of the visit was that we were able to do whatever we wanted without punishment from our grandparents. Grandma and Grandpa always had presents for us, short trips planned and lovely surprises, such as the time we got to a local restaurant and ate the world's largest hamburger.

    Diamonds are considered the most famous and valuable jewel in the world. The precious stone for its great value is believed to be the symbol of wealth. Diamonds were made as a result of great volcanic beat and pressure. When a volcano is active, it sometimes explodes and causes great damage to the nearby towns.

    However, at the same time of such a disaster, diamonds were pushed towards the surface of the earth by a number of great volcanic explosions millions of years ago. Thus, it may be very likely to find a diamond after a volcanic eruption. Besides, diamonds are also found among the sand and stones of certain river beds, and in a few places on the floor of the sea, for they were washed down the mountain sides by the rain.

    Diamonds are very rare. There are not many places that produce such precious things in the world. During the last century adventurers from Europe went to Brazil, because they had heard that there were diamonds in the River Amazon. Many of these early diamond miners died of illness or were lost forever in the great forests. But some returned home rich.

    The earliest known diamonds were found in India many centuries ago. The most recent and exciting discoveries have been made in eastern Russia. But most of the world's diamonds now come from the Congo, from Tanzania-which has the largest diamond mine in the world and also from South Africa.

    Pappadavada, a popular restaurant in Kochi, India, is urging customers and the community to put their leftover food in a fridge located outside of the restaurant for the hungry to take.

    People who are in need of a meal are encouraged to take from the fridge at any time, for any reason. Minu Pauline, who runs Pappadavada, has nicknamed the fridge, which was placed there on March 23 and is shaded by a neighboring tree, "tree of goodness".

    The fridge is open 24 hours a day, seven days a week and stays unlocked. Pauline asks that people write the date they left the food, so those who take know how long it's been there. But most food doesn't stay in the fridge for long. In spite of a huge response from the community and plenty of donations, the fridge needs to be brought more in to replace in time. Pauling herself adds around 75% to 80% of food from Pappadavada a day in the fridge.

    The idea to put a fridge on the street came to Pauline late on night when she saw a lady searching in a dustbin for food. She was especially saddened because that particular night, her restaurant had made a ton of food that they could have easily given the woman, instead of her searching for it. She felt like she contributed to waste, and avoiding waste is what Pauline pays her attention to.

    "The only thing I want to say no is that people are actually buying food and putting it in the fridge. But I'd rather people put their food they bought but aren't going to eat in the fridge instead of the dustbin," she said.

    The city of San Francisco is a wonderful tourist attraction that offers many different things to see and do. The best way for a traveler to get a good look at the city is to take one of the many different tours there

    Walk to Tour the City

    When touring the city by walking, you aren't going to walk much. What's more, there are far more benefits. This kind of tour allows you to see as many buildings of the city as possible. A tour of the city on foot usually focuses on a more localized neighborhood level, which can be very interesting in a number of different ways.

    Hit the Waters of San Francisco Bay

    The waters of San Francisco Bay have played an important role in the city's development over the last century. Touring San Francisco from the water is completely unique way for you to see this wonderful city.

    Take a Bus Tour

    If you want to see a wide variety of attractions from all over the city, one of the best things you could do is to book a tour through our company that offers services here. A bus tour of San Francisco is one of the most complete ways to experience the city

    Tour San Francisco From the Air

    While it is one of the most expensive ways to see San Francisco, touring the city from the air is one of the most unique and exciting ways to see the city. Seeing the city from high above allows you to get a full view of the city as tour guides point out attractions from high above. If you do decide to tour San Francisco by air, you'll be creating memories that you won't forget forever.

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    One of the most expensive parts of flying is the cost of gas, not to mention the environmental effect it brings. An Israeli startup called Eviation Aircraft hopes to solve the problems. They displayed the world's first all-electric passenger airplane this week at the Paris Air Show.

    The lightweight plane­playfully called Alice­will be able to fly about 600 miles between charges. So it will focus on transportation between cities. It seats nine passengers and two crew members. A typical flight should cost a customer about $200.

    "The fact that we' re building an electric plane from scratch instead of just refitting an existing plane with a battery means that we can design our aircraft to be more effective and efficient than present planes," said Eviation co-founder Omer Bar Yohay. He predicts that per seat, per mile, the cost would be equal to that of a taxi or train.

    The demand for electrically powered aircraft is projected to reach hundreds of planes per year within the next decade. The change from gas to electric in power is expected to save millions of dollars in fuel costs, not to mention the environmental benefits including significant reduction of air pollution and noise levels.

    When it comes to the new possibilities, Yosef Abramowitz, an energy industry expert, said, "In modern life, it is important to fight climate change and now we have a path to do so in flying." Abramowitz, a tireless advocate for solar power, added, "The batteries will hopefully be charged with solar energy too."

    To help further save fuel costs, the designers have also invented a "taxibot" that drags planes from the passenger gate to the runway, so the planes needn't run their engines.

    After appearing at the Paris Air Show, the Alice will travel to the U.S. for further tests. It is expected that the first commercial flights will take off in 2022.

    "I think for the first time in a very, very long time, we can look at flight again and talk about the next revolution," Bar Yohay said.

    Alice Robb is an American science journalist who has written for the Washington Post and the New Republic. Her new book, Why We Dream, encourages us to rethink the importance of dreams and to become dream interpreters ourselves.

    Reporter: Recently there's been a massive interest in the science of sleep. Sleep plays a role in maintaining our mental health. Are dreams part of that process?

    Alice Robb: Dreams play a big role in helping us cope with stress, grief and psychological problems. Dreams are an opportunity to work through things that frighten us in real life, to play out worst-case situations in an environment where they have no consequences.

    Reporter: Has anyone explained why dreams contain such surreal (超现实的) elements, strange pictures of time, people, geography and so on?

    Alice Robb：When we dream, the logic centres of our brain—the frontal lobes (大脑额叶) —go dark, and chemicals associated with self-control, like serotonin (血清素) and norepinephrine (去甲肾 上腺素) , drop. At the same time, the emotion centres light up：we have a perfect chemical canvas for dramatic, psychologically intense visions.

    Reporter：You say neglecting to consider our dreams is like "throwing away a gift from our brains without bothering to open it. " What is the gift?

    Alice Robb: When we're dreaming, we're thinking in a state we never have access to by day. Dreams offer the opportunity to think in a different way and show new answers to problems. They show us blind spots on things we might be neglecting in our personal lives.