Did you know that sixty percent of your body weight is water? However, a loss of only two percent of this water through dehydration (脱水) during exercise can significantly affect your performance. The more you sweat, the more your exercise performance declines, unless you drink enough to replace your loss of fluids (液体).

    When you lose too much water, you can overheat quite easily, especially in a warm environment. But this is not the only problem you may face. Dehydration leads to your heart pumping much faster, which means exercise becomes more difficult and requires more effort. Despite these problems, however, many of us simply do not take enough fluids in when we head for the gym or set out on a run.

    So why is this? How do we manage to lose so much water without simply drinking more to replace it? Well, it's easier than you think. When we are at rest, we quickly become aware that we are thirsty and will put that right by having a drink. When we exercise, on the other hand, our thirst mechanism (结构) does not work as effectively, so we don't notice early enough that we are actually thirsty. In fact, we only start to fed thirsty when we have already lost around two percent of our body weight.

    Another problem is that, the more dehydration we become during exercise, the more difficult it is to prevent further dehydration-because our stomachs become intolerant (不能容忍的) to fluids and we do not absorb water properly, just when we need it most.

    The key thing about fluids and exercise is to manage your intake properly-regular small amounts are preferable, and some should be drunk before the period of exercise begins. You also need to match your intake to the sort of exercise you are doing. For example, for one hour of exercise, such as taking part in a 10 km run, you need to drink about two extra litres of water. For longer periods of exercise, sports drinks are recommended.

    You may have never heard of Lanthanum, Cerium or Neodymium, but these elements (元素) and others known as “rare earth” play a major role in modern technology. They can actually be found in many places on the earth, but not in quantities that can be mined. Only a few countries — China, America, India, Australia, Brazil and Malaysia have any that can be mined enough to be traded.

Even though some of these elements such as Cerium are as abundant as Copper, they are not found in concentrated amounts on the earth's surface. They are often mixed together with other metals, which makes extraction (提取) of these elements an expensive and an environmentally messy process. It was due to this reason that the term “rare earth” was invented.

    Rare earth metals are used widely in our life. Rechargeable car batteries, computers, iPhones, DVD players, computer monitors, televisions, lighting, lasers, glass polishing, and superconductors all use quantities of rare earth metals. Also, with the advancement in “green” technology like solar panels, these shiny materials are becoming more important than ever. An average electric car uses 10 pounds of Lanthanum for its rechargeable battery!

    America has large deposits (存储量) of rare earths and has one of the first mines. It was openedin Southern California in 1940. The element “Europium” was the first metal to be separated in quantity for use in color televisions. However, in the 1980's and 1990's, as China started producing these elements in Inner Mongolia, the mines in America and elsewhere could not keep pace. The mine in Mountain Pass, California also failed environmental regulations and shut down in 2002.

    Now, recognizing the importance of having more than one supplier of this important resource, other rare earth owning countries like India and Australia are either dusting off their rare earth mines or speeding up their production. It is believed that the debate over rare earths will become louder in the coming months and years.

Urban Transportation in Canada

    Public transportation Transit passes

    All cities and most major towns in Canada have a public transportation system with one or more modes of transportation(bus, subway, train, etc. ) The bus is the most common form of urban transportation in Canada. To use public transportation, you must purchase a ticket or a transit pass. Transit passes allow you unlimited use of public transportation for a specific period (one month or more). They are usually cheaper than buying many tickets if you plan to use public transportation often.

    Transportation for people with disabilities

    Public transportation often has features to assist people with disabilities. In many cities and towns, there are also transportation services available specifically for people with limited mobility, such as specially equipped buses. You can find out about these services in the same way you would learn more about other public transportation options.

    Etiquette on public transportation

    When taking public transportation such as a bus or train, it is important to understand the unspoken rules of conduct in the shared space. Here are a few things to note:

    Be polite and respectful to others around you. For example, maintain an appropriate noise level when talking or making a phone call.

If you are carrying a backpack or a large shoulder bag in a crowded public transit vehicle, keep it close to you, preferably at your feet to avoid hitting people with it as you walk by.

    Avoid pushing or touching others in order to make more room for yourself. Sometimes public transit can become very crowded, but it is important to keep calm and give others appropriate personal space.

    Have your proof of payment accessible in case you are asked to show it.

    OK, so it's not a real war but the U. S. and China are at the beginning of a trade war thanks to President Trump's policy. The Chinese government raised $34 billion in new duties on goods exported from the U.S. last week in answer to President Trump's unwise tariffs(关税) of $34 billion on Chinese goods.

    Farm and seafood-producing states are going to be hit hardest by China's new tariffs on U. S. goods. States where cars are made and shipped to China are on the hook as well.

    In terms of value, some 38 percent of products on the tariff list are agricultural, including soybeans, sorghum, tobacco and meat. That's nothing like good news for farm-belt states, primarily in the Midwest like Iowa.

    A wide range of seafood is on China's tarifflist. That could hurt fishery workers in Alaska and lobster(龙虾) harvesters in Maine. Alaska, for example, exported nearly $lbillion worth of seafood to China. "China is a major market for Alaska seafood," said Alexa Tonkovich, Executive Director of the Alaska Seafood Marketing Institute. "The seafood industry directly employs nearly 60,000 workers in Alaska each year and directly employs more workers than any other private industry."

    And automaking States, particularly in the South, are also at risk. Some 24 percent ofproducts on the list- in terms of value-are cars, trucks and other vehicles. Michigan alone exported $1.7 billion worth of motor vehicles and vehicle parts to China in 2017. Other states being affected include South Carolina, where BMW makes SUVs for both the U.S. and export, and Alabama, home to Mercedes-Benz, Toyota, Honda and Hyundai factories.

    This round of tariffs spares some industries, like commercial aircraft. Washington State could breathe a sigh of relief, which is home to Boeing. It also, for the moment, skips tariffs on chemical products.

    Alexa Tonkovich has warned the U.S. government that the trade war could risk jobs, reduce industry profits, and cause higher prices for consumers in the U.S!

    A new mom from Michigan headed for the airport Thursday, nervous about flying alone with her -month-old. When her daughter started crying even before take-off her fears for the flight — to surprise her husband, a US Army soldier at Fort Rucker Alabama — seemed acceptable.

    The couple seated next to her reacted just as Rebekka Garvison had feared, looking visibly unhappy about sitting next to a fussy(难以取悦的)baby. Ms. Garvison moved to a new seat, hoping it would help. When the baby's cries continued, the woman sitting next to her asked if she could try.

    Garvison later described in a grateful Facebook post how the woman, Nyfesha Miller, had the magic touch with her baby. "As soon as she had her, Rylee was looking out the window and stopped crying," Garvison recalled. "When we got in the air she fell right asleep and slept in her lap the whole flight until we got to our gate? Garvison told The Huffington Post she has been in touch with Ms. Miller almost daily since the flight.

    Garvison's post has been shared more than 84,000 times, and received hundreds of warm comments. "Years ago, the same kind of thing happened to me," wrote one mother. "It was a seven-hour flight and I had my ten-month-old little boy with me. A nun （修女）was sitting beside me and she walked him up and down the passage when he got fussy. It was such a relief for me and is something I will never forget."

    Not everyone has had happy experiences with baby air travelers. One airline is considering opening a "baby class" for airplanes with flight attendant nannies（保姆）, reported The Christian Science Monitor's Meredith Hamilton. For now, parents can hope to be seated beside someone like Ms. Miller on their next flight. "Nyfesha Miller, you will never understand how happy this act of kindness has made my family." wrote Garvison.

    A new officer with the Huntington Park Police patrols (巡逻) local parks 24 hours a day seven days a week. He doesn't need rest, coffee breaks, a salary or medical insurance, and that is because it is a Robocop.

    The main function of the Robocop is to scan and film the surroundings. Besides cameras with night vision that report 360 degrees, it also has a distress button which is located here, so if somebody is to need assistance or they want to contact the communication center, they can do it by way of that distress button. There are people that are monitoring on the other end.

    This newest police employee is self-charging. It's easy to program it and make changes to the software if necessary. Its maintenance (维护) costs are roughly 75 thousand dollars a year. It travels the entire park. It is a programmed path, but the police are able to change the path and adapt it.

    The Robocop can record the license plates (车牌) of passing cars and check them against an online database of stolen cars. It can also help locate a lost iPhone because it is able to determine a smartphone's MAC address. The police can see from the robot if something wrong happens and then come and figure it out.

    The Robocop can't replace its human handlers. The whole goal is to give police more time to do things machines can't do. The police have been having some concerns about safety of the parks and want an extra set of eyes that will help patrol a 24/7.Robocop's creators believe this model known as K5 is best used for providing security at public places like hospitals, parking lots, parks and airports. So far, it seems to be working out just fine.