While beach vacations may be a great way to take your mind off work，lakes surrounded by mountains make for an even grander experience．If you are looking for some peace on your vacation，we have some recommendations for you in the Caucasus(高加索)．

Lake Sevan

    Lake Sevan is situated in the central part of Armenia，in the Gegharkunik province．It is the largest lake in Armenia，located 6,200ft above sea level．Along the lake shore，there are various accommodations such as resorts and hotels with plenty of activities to partake in such as windsurfing，swimming and sunbathing．While there，do not forget to visit one of the famous cultural monuments，the Sevanavank Monastery，and it offers a great view of the lake as well．

Lake Paravani

    Lake Paravani，located at 6,801ft above sea level，is in the south of Georgia，near the Javakheti plateau．At this level，altitude sickness can occur and it is a good idea to be prepared to adapt to it properly，or bring medication for altitude sickness．Being a volcanic lake makes for a more interesting experience．The lake is best known for fishing．Do not come home during the winter months when the lake freezes．

Lake Cildir

    Lake Cildir is located in the Ardahan province，East Turkey，near the borders of Georgia and Armenia．It is the second largest freshwater lake of Eastern Turkey，and many tourists are not aware of this beautiful attraction．Lake Cildir is surrounded by mountains of the Caucasus．The lake freezes during late November．If the winter is not extremely cold，you can try some lake activities like ice skating and ice fishing．

Lake Van

    Lake Van is the must visit of all lakes in this list．The largest lake in Turkey，Lake Van is located on the eastern shore of Turkey and is also the most accessible lake here．It's situated at 5，380ft above sea level，and unique to lakes around the world，the water is high in salt content．

    Will there be a time in our lives when cars don't crash? When we can just sit back and relax and our cars will drive themselves. Auto technology experts say “yes”. And they say that some of those advances may happen quicker than you might think.

    They will require the users to input the name of the destination or the complete address of the location that they want to go and the cars' artificial intelligence takes them there automatically without a driver. They will run on solar power in the daytime and ethanol fuel (乙醇燃料) at night. Toyota, BMW and Honda will completely control the trade of driverless car business together and will have the cheapest driverless cars. Fossil fuels will be completely incompatible (不相配的) with these cars.

    Driverless cars will not require a driver's license of any grade to operate. Anyone with basic literacy and computer skills who are at least 16 years of age will be legally allowed to operate the vehicle with absolutely no limits.This would give the young users permission to operate the driverless cars on major highways as well as secondary roads without needing a separate classification. In addition to all this, drunken people will be able to use their own automobiles to return home because they are not “driving”, the vehicle.

    What's more, car insurance will become obsolete(淘汰的) because there will be no more automobile accidents after the year 2025. This is because the driverless car will have all safety methods in place by the car's artificial intelligence to prevent automobile accidents. Global positioning systems will become mandatory (强制的) in all newly-produced cars after 2010, and will be the most important part in the driverless car.

    All too often, a choice that seems sustainable(可持续的)turns out on closer examination to be problematic. Probably the best example is the rush to produce ethanol(乙醇) for fuel from corn. Corn is a renewable resource —you can harvest it and grow more, almost limitlessly. So replacing gas with corn ethanol seems like a great idea. 

    One might get a bit more energy out of the ethanol than that used to make it, which could still make ethanol more sustainable than gas generally, but that's not the end of the problem. Using corn to make ethanol means less corn is left to feed animals and people, which drives up the cost of food. That result leads to turning the fallow land –including, in some cases, rain forest in places such as Brazil—into farmland, which in turn gives off lots of carbon dioxide (CO) into the air. Finally, over many years, the energy benefit from burning ethanol would make up for the forest loss. But by then, climate change would have progressed so far that it might not help.

    You cannot really declare any practice “sustainable” until you have done a complete life-cycle analysis of its environmental(环境的) costs. Even then, technology and public keep developing, and that development can lead to unforeseen and undesired results. The admirable goal of living sustainably requires plenty of thought on an ongoing basis.

    Gravity signals that race through the ground at the speed of light could help seismologists(地震学家) get a better handle on the size of large, destructive quakes soon after they hit，a study suggests. The tiny changes in Earth's gravitational field, created when the ground shifts, arrive at earthquake monitoring stations well before earthquake waves.

    “The good thing we can do with these signals is have quick information on the magnitude (震级) of the quake,” says Martin Vaillée, a seismologist at the Paris Institute of Earth Physics.

    Earthquake equipment in China and South Korea picked up gravity signals immediately after the magnitude-9. 1 Tohoku earthquake that destroyed parts of Japan in 2011. The signals appear as tiny accelerations on earthquake-recording equipment, more than a minute before the seismic waves show up.

    “We can look before the earthquake waves arrive,” says Vallée. “If we see nothing, we can say that the quake that made these was maybe large, but not huge. If we see the signals, it means we really have a very big quake. ”

    Had seismologists been monitoring for gravity changes, they might have realized sooner just how big the Tohoku earthquake was. A small increase in an earthquake's magnitude means a large change in the energy released by the quake-and the destruction expected. That information is important for emergency responders as they decide what resources to arrange.

    It'll be a major contribution if gravitational waves can beat down the time needed to know that a big earthquake is big. But much work remains before gravity signals can be considered a reliable tool in the vital minutes after a big quake. A few extra minutes of warning can save lives, particularly in coastal areas where people can flee ahead of an incoming tsunami.

    Jacob's Pillow Dance Festival

    Where: Becket, Massachusetts

    When: June 15-Aug. 24

    Each summer, this influential dance center presents a number of classes and performances by more than 50 companies from around the world. Highlights(精彩的部分) this season include the Dance Theater of Harlem's production of Alvin Ailey's “The Lark Ascending”, which opens the festival.

    Many events are free. Ticketed performances start at $22.

    Moab Music Festival

    Where: Moab, Utah

    When: Aug. 29-Sep. 9

    This area is better known for mountain biking than for music. But since 1992, it has hosted a private festival that brings classical, jazz, Latin and other types of music to the land. This year there will be 16 concerts, including three “Grotto Concerts”, where guests take a 45-minute boat ride down the Colorado River to performances.

    Events start at $25.

    Cheyenne Frontier Days

    Where: Cheyenne, Wyoming

    When: July 19-28

    There's something for everyone at this 117-year-old festival, from an “Indian village” and Old West museum to country concerts. But the competition is still the main attraction, with cowboys(牛仔) and cowgirls competing for major money in the world's largest outdoor stage.

    Competition tickets start at $18, and concert tickets at $23.

    The Glimmerglass Festival

    Where: Cooperstown, New York

    When: July 6-Aug. 24

    Each summer, opera lovers from around the country (and the world) travel to upstate New York to watch productions that include stars like Nathan Gunn and Ginger Costa-Jackson. This year's performances include Wagner's “The Flying Dutchman” and Verdi's “King for a Day”, in honor of the 200th birthdays of both composers.

    Tickets start at $26.

    How many times have you come back and felt terribly tired, feeling like your head is going to explode? Sounds familiar, right? Well, there are several ways to reduce the frequency of headaches, and those are: eating balanced diet through the day, making sure your body is well hydrated (保持身体水分);getting some exercise to remove the negative energy, like helping yourself with a short massage (按摩)on your head. However, preparing an easy recipe will instantly put a smile on your face after your workday.

    You will need these simple ingredients (配料)to prepare the magical drink which will stop your headache: Lemon juice; 2 teaspoons of salt (preferably high quality salt); 1 cup of water.

    Directions:

    Squeeze 2 lemons. Pour the lemon juice into a cup and add 2 teaspoons of salt. Mix the two ingredients. Add a cup of water to the content. Drink the mixture quickly.

    How will this drink work and what are the benefits of its ingredients?

    Salt: Here is what salt does for your body: regulates your blood sugar, balances the sugar levels; benefits nerve cells for communication and information processing; obtains acidity from your body's cells, especially brain cells; works as a strong anti-stress element for the body; adds energy in your body's cells.

    Lemon Juice: This excellent juice, full of vitamin C and anti-poisons, will release all poisonous substances from your body and give you a sense of lightness. Here's how the lemon will help you ease your headache and maintain well-being to your whole body: balances the pH levels in your body; protects your immune system; nourishes your brain and nerve cells; reduces inflammation (炎症)in your whole body (the headache is a type of inflammation, so the lemon juice fights against it).

    Water：

    Water is important for hydrating your whole body, including your head. Many of your daily headaches may be caused by dehydration (脱水), so keep in mind that you should drink plenty of water throughout the day.