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I've never had a great sense of direction. And I often wander into shops and, upon coming back out, can't remember which way I've come from — left or right? Many people are like me, and why do some constantly have no idea where they are?

The hippocampus (海马体) is a region of the brain associated with memory and involved in sense of direction. And a nearby region has also been associated with sense of direction. There are four known types of navigation-related neurons (神经元), found in these regions place cells, grid cells, border cells and head direction cells.

In short, you can think of place cells as an internal cognitive (认知的) map; they identify where you are. Grid cells are like a GPS system in our brain; they tell us about the relationship of this place to other places we've been to. Border cells respond to the presence of environmental boundaries at a specific direction and distance from us. Lastly, head direction cells are activated when our head faces a specific direction. These cells will fire electrical impulses when we enter familiar locations, with each group of cells relating to a specific place.

Our reliance on GPS and smartphones may have decreased the ability to use our internal maps. Older adults who regularly used GPS had less activity in their hippocampus, compared with those who did not use GPS. They also performed slightly worse in a cognition test. In contrast, a study involving London taxi drivers found they significantly larger hippocampus than ordinary people.

You can improve your way-finding ability specifically by practicing the skill, according to Aziz, PhD of neurology at Temple University School of Medicine. "The more you get out and go to places, the better," he says. Physical exercise improves the blood flow to the brain, while mental exercise, such as doing puzzles or learning a new language, stimulates the development of new nerve cells and connections in your brain.

During World War II, Duchess Nina Douglas-Hamilton played a vital role in looking after animals.

As the war broke out, the government issued orders for the mass killing livestock (家畜) to prevent them from being captured or destroyed by the enemy. Duchess Nina launched a campaign to save as many animals as possible, and soon became known as the "animal heroine" for her efforts.

Duchess Nina worked with local farmers and animal owners to relocate animals to safer areas, such as the Scottish Highlands. She also established a network of volunteers who helped to care for animals during the war. She organized feeding programs, medical care and transportation, ensuring that animals were well looked after even during the most difficult times. The most challenging aspect of her work was the shortage of food during the war. So she established a vegetable garden and used leftovers to create nutritious meals for animals. She also reached out to the public for donations of food and supplies, and was able to secure enough resources to keep animals healthy and fed.

In addition to her work with domestic animals, Duchess Nina wạs also a strong advocate for wildlife conservation. She established a center for wild animals Scotland, where she provided a safe place for deer, foxes and other animals that were threatened by the war. She also worked with local protection groups to protect natural habitats.

Duchess Nina's work during World War II was not without its risks. She frequently risked her life to save animals, often driving through perilous areas.

Sadly, some people saw her efforts as a distraction from the war effort. However, she continued to work tirelessly for animals. After the war, Duchess Nina's work was recognized by the government and she got an important award for her services to animals.

Have you ever dreamed of having your own custom deck (木制平台)? Decks make a beautiful addition to any home and they are great places to sit and relax. Here, we discuss several benefits of installing a custom deck on your property. 

● Great meeting places. Does your family love to have a barbecue? A custom deck will give you plenty of space to host a barbecue, family picnics, and neighborhood parties. A deck can make a great meeting place for just about any open-air event.

● Room to grow. Decks are great places to grow your own food. A container garden can grow many of the fruits and vegetables you love to eat without the hassle of a traditional garden. So if you have green fingers (good at making plants grow), you should really think about adding a deck to your property soon. 

● Quick installation. Most decks can be built in just a few days to weeks. While they are highly durable and permanent structures, they can be installed fast. This means that you will be able to enjoy your investment right away without the need to wait. 

If you want to take advantage of these benefits, contact the decking professionals at https://newdaydevelopment.com/ to help you design and build the perfect deck for your needs. With our help, you can create a beautiful place to relax outside and enjoy special memories together. We'd be happy to discuss your questions or concerns.

注意：1．词数100左右；2．可适当增加细节，以使行文连贯。

参考词汇：Marathon马拉松

Dear Mike,

……

Yours,

Li Hua