Every year, millions of birds are killed or hurt when they fly into buildings. Why does this happen?  Birds are flying into windows and tall buildings that are all covered by glass.

Many birds fly from one place to another. Most of the time, they live in the wild, such as forests and wetlands.  They might see small trees and flowers inside a window and want to rest on these plants. The birds do not know there is glass between them and the plants.  

Some birds fly at night. They use the moon and stars to help guide them in the right direction. Tall buildings with lights on at night can confuse（迷惑）the birds.  The birds see the light, but they cannot tell that the light is coming from inside a building. They fly toward the light and crash into a building. On many mornings, there might be several dead birds lying on the ground.

  Many office buildings now turn off their lights at night. This helps reduce the number of birds that fly into buildings and it also helps save energy.

Brainstorming is the practice of coining up with ideas or solutions. But we do have some rules to follow for successful brainstorming.

Focus on quantity （数量）over quality. When it comes to brainstorming, the more ideas, the better.

Don't worry about the quality of your ideas for now. Remember that your goal is to come up with as many ideas as possible. Even if none of them are perfect, you'll still have many creative ideas to use for your final plan.

Encourage big or unusual ideas. Although unusual ideas may not be immediately practical, just creating those ideas gives your brain training. It can also help to produce creative solutions that are hard to come up with.

Don't say no to the ideas of others. You can put together the best parts of different ideas to create new, even better ones. Even if you're not brainstorming as a group, you should still think about sharing your ideas with others and asking them for their advice.

You don't have to regard yourself as a very creative person to come up with excellent ideas and solutions at once. Even if you don't find the perfect solution, just practicing it can help to improve your creativity. Put these tips together and you are sure to come up with some great ideas.

Do you know the self-driving bullet (子弹) train just for the Beijing Winter Olympics? Is there anything new on the train? Let's have a look!

The train links (连接) Beijing and Zhangjiakou, the co-host cities of the Games. With a top speed of 350 kilometers an hour, the train can run the 174-kilometer journey between the two cities in around 50 minutes, while a regular express (特快的) train takes three hours.

It is said to be the world's first high-speed train with a 5G live broadcast studio (现场直播演播室). It can carry 564 passengers each trip in its eight cars (车厢). It has business, first-class and second-class cars. Besides, for the needs of media (媒体), it also has special working cars with 12 tables and international electric sockets (电源插座).

The train is painted in white and blue colors and there are 24 snowflakes (雪花) on the outside of the train, showing this is the 24th Winter Olympic Games. Inside the train, there are winter sports photos on the walls and paper snowflakes on top.

The Beijing Winter Olympic Games opened in February, 2022. The high-speed train provided transportation services for the 2022 Winter Olympics and the Paralympics (残奥会) from January 21 to March 16. Up to 40 pairs of trains traveled between the two cities every day.