Electric cars have been gaining popularity in recent years, and for good reason. Not only are they cost-effective in the long run, but they also offer many benefits for the environment. Here are three reasons why electric cars are great for the planet.

One of the biggest advantages of electric cars is that they produce zero emissions (排放). Unlike gasoline cars that emit harmful pollutants into the air, electric cars are powered by electricity that is generated from renewable sources such as wind or solar power. This means that when you drive an electric car, you’re not only saving money on gas, but you’re also helping to improve air quality.

Electric cars also save more energy than gasoline cars. When you drive a gasoline car, only about 20% of the energy made by the fuel is actually used to move the car forward. The rest of the energy is lost to heat and other things. Electric cars, on the other hand, convert (转化) almost 100% of the energy stored in the battery into motion. This means that electric cars can travel further on the same amount of energy, which is great news for the environment.

Another benefit of electric cars is that they reduce our dependence on fossil fuels. Gasoline cars are powered by gasoline, which is a non-renewable resource that is taken from the earth. As we continue to use gasoline, we’re using the earth’s natural resources and contributing to climate change. By driving electric cars, we can reduce our need for gasoline and move towards renewable sources of energy.

In conclusion, electric cars offer many benefits for the environment, including zero emissions, energy efficiency, and reduced need on fossil fuels. As more people make the switch to electric cars, we can help to create a cleaner and more sustainable future for ourselves and for future generations.

Back in ancient times, philosophers（哲学家）like Aristotle were already thinking about the origins of taste, and how the tongue sensed basic tastes like sweet, bitter, salty and sour.

“What scientists discovered just a few years ago is that there are areas of the brain where certain fields of neurons（神经元）respond to these different tastes. So there’s a sweet field, a bitter field, a salty field and so on, ” said Nick Ryba, a neuroscientist at the National Institutes of Health.

But Ryba and his colleagues have found that we can actually taste without a tongue at all, simply by turning on or off the “taste” part of the brain. And by turning on the “bitter” sensing part of the brain, they were able to make mice pucker up（咧着嘴）, as if they were tasting something bitter—even though nothing bitter was touching the tongues of the mice.

In another experiment, the researchers fed the mice a bitter taste on their tongues—but then made it more palatable by turning on the “sweet” zone of the brain. “What we were doing here was adding the sweetness, but only adding it in the brain, not in what we were giving to the mouse. ”Think adding sugar to our coffee—but doing it only in our mind.

Ryba says the study suggests that a lot of our basic judgments about taste—sweet means good, bitter means bad—are actually made at the level of the brain. As for that virtual（虚拟的）-sugar-in-your-coffee idea? “I thought it’s basically science fiction to think that this would be something that would be used on humans. But today’s science fiction might be tomorrow’s artificial sweetener, ”he added.

A South Korean company is operating the country’s largest indoor “smart farm” inside a former road tunnel (隧道). The farm produces fruits and vegetables hydroponically (水培), which means the plants do not grow in the ground. Instead, they grow on vertical (垂直) equipment that provides a continuous flow of water.

There are other vertical smart farms in South Korea. But this one, built by the company NextOn about 200 kilometers south of Seoul, is the nation’s biggest. It is also one of the largest indoor vertical farms in the world, with a total area of 2, 300 square meters. But what makes the farm even more unusual is the fact that it sits inside a huge tunnel. The tunnel was built in 1970 for one of South Korea’s first major highways, but it closed down in 2002. NextOn signed an agreement with the government to take over the tunnel and turn it into a high-tech farm.

NextOn officials say the tunnel environment provides ideal conditions for an indoor farm. It keeps a steady temperature of between 10 and 22 degrees Celsius. The tunnel s also completely dark, making it easier to provide exactly the night amount of artificial light.

The farming system can produce more than 60 different kinds of fruits and vegetables. The company said foods produced in the indoor farm are also healthier since harmful chemicals are not necessary to prevent large insect attacks. It can be difficult, though, for smart farmers to make a profit because of the high cost of building and operating. But NextOn said it cut its building costs in half by using the former tunnel and developing its own lighting and water systems. These technologies reduced water and energy use and the need for workers. Sensors also measure things such as temperature, light and air quality.

In South Korea, indoor vertical farming is seen as a possible solution to crop damage related to extreme weather that could get worse due to climate change. The country’s farming industry has also been hurt by shortages of land and workers.

The company says it plans to expand its farm inside the tunnel in the near future to begin growing even more kinds of fruits, as well as plants used for medical purposes.