The giraffe is the tallest modern land animal. It can be over 5. 5 meters tall. Its neck alone may be 1. 9 meters long. Yet the giraffe has only seven bones in its neck, the same number as in the humans'. Even a small bird has many more bones in its neck than a tall giraffe. Each bone in a giraffe's neck is very long, while the bones in a human's neck are short. That makes the difference. A female giraffe gives birth to one baby at a time. The baby, called a calf, is about 1. 9 meters tall at birth. By the age of eight it is full-grown. The giraffe eats mostly leaves. Because it has a long neck, it can reach the high leaves on the trees.

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    The name of our galaxy(星系), the Milky Way, comes from its appearance. It's a milky white band of glowing light that spreads across the night sky. If you look up at the evening sky, there's a good chance you will not be able to see what your grandmother saw when she was a little girl. A new study says that nearly 80 percent of people in North America can't see the Milky Way because of light pollution.

    The most light-polluted country in the world is Singapore where researchers found that people living in the country never have the chance to experience true darkness. Other countries with large percentages of people living under such skies include Qatar, Kuwait and the United Arab Emirates.

    Too much light has a direct influence on human physiology and behavior. It can also destroy our sleep cycle. What's more, it also influences wildlife. For example, baby turtles may not swim into the ocean because of street lights near shorelines.

    In the U.S., some communities have been taking action on light pollution but in developing countries, people still want to make bigger, brighter light, like LED lights. They can save energy, but on the other hand, they will increase light pollution rapidly in fact.

    There are still people that can remember when they used to be able to see the Milky Way, when they would walk outside at night, but those are becoming fewer and fewer.

    Nighttime natural scenery needs protection just like daytime scenery. Don't let the light pollution steal the chance to experience the wonder of a natural night sky from us.

Teddy bears

Children everywhere love toy bears, and people have been making them for hundreds of years. They also like stories about young bears. Three of the most famous storybook bears are Rupert Bear, Pooh Bear, and Paddington Bear, and most children in Britain and America also know the story Goldilocks and The Three Bears. At the moment so many children and adults too like toy bears and there are shops that sell only toy bears of all kinds. 

Many people call toy bears "Teddy" although this name has been used only since the beginning of the 20th century. The word "Teddy" comes from Theodore and a man called Theodore Roosevelt was the president of the United States from 1901 to 1909. Because people liked him very much and they called him Teddy, and because he had a toy bear, they called their own bears Teddy, too. 

 Good sleep is really important to our health. But global heating is leading to increases in night-time temperatures that are happening faster than they are during the day. This makes it harder for us to get quality sleep. As global temperature increases, the average global citizen is already losing 44 hours of sleep every year, a recent study revealed. 

 The study used sleep and outdoor weather data collected from 2017 to 2022. It found that higher temperatures reduced sleep by putting off its onset. People's bodies need to cool every night as they fall asleep, but this is harder to do when it is warmer. 

"Some groups, however, will be affected much more than others. " said Kelton Minor,  a researcher from the University of Copenhagen. The sleep loss per degree of warming is about a quarter higher for women than men, twice as high for those over 65 years old, and three times higher for those in less wealthy nations. 

"Women usually have higher levels of fat than men, which may make the cooling time longer. Older people are known to sleep less at night and have poorer body temperature regulation(调节). People in poorer nations could lose more sleep, as it's harder for them to get cooling machines. " he explained. 

 The studies have also shown that rising temperatures hurt health, including increasing the possibilities of heart diseases, mental health problems, accidents and injuries. They have also been found to reduce one' s ability to work and study. Poor sleep has also been shown to have these effects. However, disturbed sleep may be a key reason why researchers are seeing these heat related health problems. 

 Worryingly, there were no signs of people being able to adapt to hotter nights. The growing numbers of people in many countries around the world are simply not getting enough sleep.