5 . How tall are you? Do you tower over your friends and family - or are they people you literally have to look up to?     1     But do you know that there’s a possibility that we’re all getting taller?

Of course, our height is out of our control.     2     The idea that being taller gives you more power and authority might be a tall story, but according to David Robson, writing for BBC Future, “on the basis of first impressions alone, taller people may have the edge.” He adds that various studies have found that the greater your height, the higher you score on measures of happiness and enjoyment of life.

    3     Scientists have known for a long time that humans with good diets and reliable access to food tend to grow taller and mature more quickly. Adult height in some countries has rocketed as they transformed into a developed society.

In a recent study scientists have discovered a brain receptor, called MC3R, linked to our growing process.     4     “It tells the body we’re great here and we’ve got lots of food, so grow quickly, have puberty (发育期) soon and make lots of babies. This discovery could lead to drugs to improve muscle mass and treat delayed growth,” UK researchers say.

For those eager to be taller, we need to look at the Dutch, who stand head and shoulders above the rest of us as the tallest people in the world. But, of course tall people have to stoop (俯身) through doorways and struggle to fit in cars and can have joint and cardiovascular problems.     5    

6 . Perhaps you use your headphones to enjoy music and peace and quiet during the day. But you may be neglecting the dangers of hearing loss with headphones.     1     This is 30% higher than just 20 years before, and experts are pinning it on headphones.

In fact, headphones are not a bad thing. They can bring peace, allow for better musical enjoyment, and even protect your ears from higher decibels(分贝).     2    

How long should you wear your headphones every day? The answer is, according to the World Health Organization, one hour per day.     3     But the fact is that the longer you listen, you’re going to lose your hearing sooner. To keep hearing loss from happening to you, you should follow the recommendation in place by the WHO that you keep your time with headphones on limited to one hour per day.

Then, how do you set the safest volume for your headphones? With headphones, it depends on the type you’re using and your environment. To test things out, you should take them off your ears and extend them in your hands out in front of you.     4     If you are using open-back headphones, you should try to have a conversation with someone nearby. When you’re able to carry on the conversation clearly, you’re listening at a proper volume. But do remember that never raise the volume on your listening device over 60% of the maximum!

    5     At others this loss will build up over time. It usually isn’t noticeable in the beginning. It’s not until it’s too late that most people realize that the damage has been done. The only way to know for sure is to consult your doctor.

7 . As time goes on, neuroscientists learn more about the wonders of human brains. The deeper understanding offers ways to enhance your brain to work in your favor. You don’t have to be a brain scientist to do it!     1    

When you hear the word hack, you might be reminded of the snaky computer science term. Computer hackers need to understand the inner workings of a computer to break into its system.     2     They need to know how the brain works to change its neural network. With this knowledge, people have come up with ways to optimize brain performance and stick to healthier habits.

Neurohackers use their knowledge of how the brain works to change though patterns, like daily habits. Doing this requires understanding the way habits form in the brain. Whenever you repeat a task, the brain connects its wires together between brain cells. Over time, these habits become hardwired into the brains.     3     They help carry out simple everyday tasks without much thought or attention. The trouble comes up when your brain wires unhealthy habits, such as negative self-talk.

    4     You need to rewire! And that requires mindfulness — a conscious awareness of your brain’s behaviors and patterns at the very moment when they occur. In this way, you can change those habits in the direction that you want.

Below the conscious mind lives the subconscious, a deeper mental space that hosts what you have previously engraved into your mind.     5     Then, you can “hack” brain patterns, train thoughts toward positive circuits, and slowly develop healthier habits over time.

9 . Wisdom teeth removal is common for many people in their late teens and early 20s. But why don’t they come in during childhood with the rest of our permanent teeth?

The answer comes down to child development. There’s not enough room in a child’s jaw for wisdom teeth.     1     So there’s more room for wisdom teeth to emerge.

However, many modern human jaws don’t grow long enough for wisdom teeth to come in. Ancient humans ate diets full of hard nuts, uncooked vegetables, and other tough foods.     2     But nowadays we have shifted to eating softer foods, meaning humans have shorter jaws than ancient humans do.

There is another reason wisdom teeth grow in later.     3     When ancient people would lose their molars (臼齿) from chewing tough food, wisdom teeth — the third set of molars — would take their place. But because most people don’t lose their molars as young children, wisdom teeth wait until adulthood to arrive.     4    

Nowadays, dentists often remove wisdom teeth because their emergence can cause pain in crowded mouths. Or it can cause problems and tooth damage later on.     5     But as a person gets older and their gums (牙龈) become weaker, their wisdom teeth may stick through. In this case, they tend to cause pain and needs removing.

Eyes are the window of our soul. We humans are only born    1    one set of eyes, so it is our job to take care of them. Almost all doctors agree    2    we can improve and maintain good eyesight by     3    (eat) lots of fresh vegetables. It is    4    (especial) important for us to eat vegetables like carrots and sweet potatoes.    5    , it is necessary    6    (protect) our eyes when we spend a long time in using computer, and we should take    7    short break every fifteen minutes to reduce the     8    (chance) of losing our eyesight. As the saying    9    (go), “It’s all fun and game, until someone loses an eye”. If you want to know more about protecting your eyes, please    10    (click)the following website.