San Francisco is a wonderful vacation destination that offers many different things to see and to do. The best way for a traveler to get a feel for the city is to take one of the many different tours there.

    Foot. When touring the city by walking, you aren't going to walk much. There are far more benefits to touring the city on foot, though. This kind of tour allows you to see many of the buildings. It usually makes you see a more localized neighborhood level.

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

    Bus. If you want to get a great feel for the layout of the city, one of the best things you could do is book a tour through our company. A bus tour of San Francisco is one of the most complete ways to experience the city.

    Air. While it is the most expensive way to see San Francisco, it is also one of the most unique and thrilling ways to see the city. Seeing the city from high above allows you to get a good feel for the layout of the city as tour guides point out landmarks and attractions. If you decide to tour San Francisco from the air, you'll get memories that you won't forget forever.

    We are a travel agency with good service. For more information, please click here.

    A new study finds almost one third of the world's population is overweight. Since 1980, obesity rates(肥胖率)in children and adults have doubled in 73 countries, making people more worried. And rates are increasing in many other countries. Obesity is increasing faster in children than adults in many nations, including Algeria, Turkey and Jordan, the report said. But the world's weight problem is growing in both rich and poor countries alike. Researchers say an increasing number of people are dying of related health problems in what they called a "disturbing global public health problem."

    Researchers studied health information from 1980 through 2015. They examined obesity rates, average weight gain in 195 countries. They found that obesity rates are three times greater among youth and young adults in countries like China, Brazil and India. Almost 108 million children and more than 600 million adults were found to be overweight. Egypt had the highest number of overweight adults in 2015. Vietnam had the least. In the same year, the United States had the highest number of overweight children, and Bangladesh had the least.

    Yet hunger remains a problem in many areas. The United Nations said that almost 800 million people, including 300 million children, go to bed hungry each night. Experts said poor diets and lack of physical activity are mainly to blame for the rising numbers of overweight people.

    Growing populations have led to rising obesity rates in poor countries. Often, poor people will eat processed(加工的) foods instead of choosing a diet rich in vegetables.

    The London-based Overseas Development Institute studied the price of food in five countries: Britain, Brazil, China, Mexico and South Korea. It found that the cost of processed foods like ice cream and hamburgers has fallen since 1990. But the cost of fresh fruits and vegetables has gone up.

    Tornadoes are nature's most violent storms, which can cause deaths and destroy a neighborhood in seconds. A tornado appears as a funnel-shaped (漏斗状) cloud from a thunderstorm to the ground with whirling (飞快移动) winds that can reach 300 miles per hour. Damage paths can be over one mile wide and 50 miles long. Every state is at some risk from this disaster.

    Some tornadoes can be seen clearly, while rain or nearby low-hanging clouds obscure others. At many times, tornadoes develop so rapidly that little, if any, advance warning is possible.

    Before a tornado hits, the air may become very still. A cloud of debris (散片) can mark the location of a tornado even if a funnel can not be seen. Tornadoes generally occur near the edge of a thunderstorm, when the strong wind may die down. It is not uncommon to see clear, sunlit skies behind a tornado.

The following are facts about tornadoes:

    The average forward speed of a tornado is 30 MPH, but may also vary from still to 70 MPH. Debris is picked up or a cloud forms in the funnel.

    The average tornado moves from southwest to northeast, but tornadoes have been known to move in any direction. Tornadoes are most often reported east of the Rocky Mountains during spring and summer months.

    Tornadoes can happen together with tropical storms and hurricanes as they move onto land. Waterspouts are tornadoes that form over water.

    The tornado season in the southern states of America is March through May; in the northern states, it is late spring through early summer. Tornadoes are most likely to occur between 3 p.m. and 9 p.m., but can occur at any time.

    A British friend told me he couldn't understand why Chinese people love eating sunflower seeds as a snack so much. “I've met a lot of older Chinese and many have a crack in their front teeth; I believe that's from cracking the seeds, ” he said.

    I had never noticed the habit, but once he mentioned it, I suddenly became more aware. I realized that whenever I'm watching TV or typing a report, I always start mindlessly cracking sunflower seeds. My friend doesn't like sunflower seeds, and, to him, it seems unnecessary to work so much just to get one small seed.

    When we were young, the whole family would usually get together for Chinese New Year. Then, we all lived close to one another, usually in a small city, and sometimes even neighbors would go door-to-door on Chinese New Year's Eve to check out what every household was making.

    I remember my parents would be in the kitchen cooking. Out in the living room , a large table would already be laid out, complete with fancy tablecloth, ready-made dumpling fillings, and dishes full of candy, fruits and sunflower seeds. Some of the dishes were to be offered to our ancestors later, while others were for neighbors and children to eat before the evening feast. I must have learned how to crack sunflower seeds back then.

    I don't think it's right to criticize one's choice in food or eating habits, no matter how strange they may seem.

    It's not only in China. When I went abroad, I found people had all sorts of strange habits when it came to food. In Denmark, they put salted red fish on bread and eat it for dinner, no matter how much it ruins your breath. They think it's a delicacy, and it's connected to their culture. I think it's a wonderful tradition.

    Researchers have been investigating for years the ways in which screens affect the quality of a person's reading. The magazine Scientific American reported that at least 100 studies have been published on the issue since the 1980s.

    Virginia Clinton carried out a research examination. She is a professor of Education, Health and Behavior at the University of North Dakota. She found what she called a "small but significant" difference in reading text from screen versus paper.

    Clinton looked at 33 past studies that examined paper versus screen reading. All of the studies were done between 2008 and 2018. The studies collectively had 2,799 study subjects, including both children and adults. Clinton's examination found that reading from paper generally led to better understanding and improved a person's performance on tests connected to the reading material. And, she found no major differences in reading speed between the two.

    Clinton and other researchers have found screen readers often believe they understand a text better than they really do. And, they are more likely than paper readers to overestimate how well they would do on a test of the materials they have read.

    Yet, this overestimated sense of understanding is especially common among screen readers. Clinton said, "There are many possible reasons for such findings. Overconfidence of reen readers, for example, could be the result of a distracted, less focused mind. Readers' preferences are also important. Research shows the majority of people of all ages prefer reading from paper. If you are enjoying the reading process, you're going to be more involved. You're going to be paying better attention. Preferences are a key issue here."

    Several studies have found that people often think of paper materials as something more important and serious. "If you are reading from paper, your mind thinks this is something important. I need to pay attention to it," Clinton said.

Perhaps you know them as "taters," "spuds," or "Kennebees," or as "chips," "Idahoes," or even "shoestrings. " No matter, a potato by any other name is still a potato - the world's most widely grown vegetable. As a matter of fact, if you are an average potato eater, you will put away at least 100 pounds of them each year. 

That's only a tiny amount grown every year, however. Worldwide, the annual potato harvest is over 6 billion bags. Each bag contains 100 pounds of potatoes, some of them as large as four pounds each. Here in the United States, farmers fill about 400 million bags a year. That may seem like a lot of "taters, " but it leaves the United States a distant third among world potato growers. Polish farmers dig up just over 800 million bags a year, while the Russians lead the world with nearly 

1. 5 billion bags. 

People eat potatoes in many ways-baked, mashed, and roasted, to name just three. However, in the United States most potatoes are devoured in the form of French fries. One fast-food chain alone sells more than $1 billion worth of fries each year. No wonder, then, that the company pays particular attention to the way its fries are prepared. 

Before any fry makes it to the people who eat at these popular restaurants, it must pass many separate tests. Fail any one of these tests and the potato is rejected. For example, only Russet Burbank potatoes are used. These Idaho potatoes have less water content than other kinds, which can have as much as 80 percent water. Once cut into "shoestrings" shapes, the potatoes are partly fried in a secret blend of oils, sprayed with liquid sugar to brown them, steam dried at high heat, then flash frozen for shipment to individual restaurants. 

So, now that you realize the enormous size and value of the potato crop, you can understand why most people agree that this part of the food industry is no "small potatoes. "