One of the hottest places on the earth is Death Valley. It's a desert valley in North America. The animals in Death Valley don't use technology to keep cool. They have special abilities that help them live there.

    The kangaroo rat is one animal that lives in Death Valley. During the day in Death Valley, it gets hotter than 100°F. The kangaroo rat rests all day in a hole in the ground. It covers the hole with grass to keep out the heat. The kangaroo rat comes out at night when it is cooler. This little rat is also very good at conserving (节约) water. It gets all the water it needs from the food it eats. Some kangaroo rats never take a drink of water in their whole lives!

    The sun makes the desert sand very hot. Animals, like snakes, get too hot if they lie on the hot sand too long. One snake, called the sidewinder, can solve this problem. When it travels, the sidewinder bends (使弯曲) its body into a“W”shape. Then it uses the bottom (底部的) parts of the“W”like legs and walks sideways (向一侧). That way it touches only a little of the sand at a time, so the hot sand doesn't burn the snake. This strange way of moving is how the sidewinder got its name.

    A lot of water in the desert is too salty for most animals to drink. All water has some salt in it. As the desert heat dries up pools of water, the salt is left behind. The remaining water in these pools can be much saltier than the ocean. One kind of fish, the desert pupfish, can live in these salty pools because it can drink the salt water.

How honey is made

Have you ever kept putting your head down to look at a screen until your neck hurts？1 so，you've experienced tech neck.Tech neck takes place when the use of phones，computers and other technology causes neck pain.These days it's a common problem2 .

Your neck muscles（肌肉） are designed to hold your3 upright（竖直的）.They can also move your head around.But bending（弯曲） your head forward4 a long time can pull your muscles hard.That can make them5 .

In the past people spent most of their time looking up.But now people spend more time looking6 at their phones.They often hold them far below the head.This causes people to have to crane（伸长） their necks to see the phone7 which，in turn，causes tech neck.Bending over to watch the screen of a computer on a desk can have a similar8 .

It might be impossible to expect people to give up their phones to 9 tech neck.And completely refusing technology isn't necessary.However，you can do10 to improve this situation.

First，you can hold your phone up higher——so you don't have to bend down to look at it.But this can be tiring for your either11 .So keep your head upright，and look only with your eyes.When using the computer，try to12 straight as well.Slumping in front of a screen can hurt your back.

Also，take13 .Once in a while，look up from your screen，and move your shoulders back.If you've been sitting14 at times to relax your muscles.

If you continue experiencing tech neck，you can do exercises to feel good.Tech neck is a 15 result of using today's technology，but it doesn't have to be.If you are serious about the problem，you can take actions to avoid it.

If you are hiking with a friend who is overweight, you may hear them say that the hills look steeper(更陡峭的) and the distances look farther away than what they really are. Is your friend lazy? Actually, this is just what the world looks like in their eyes.

 Scientists from Colorado State University show that being overweight distorts perception(扭曲知觉). They think distances are farther away than they actually are.

 In one study, scientists asked 66 people of different weights and sizes to say how far away a traffic cone (交通围标) was. The cone was actually 25m away. Those who were about 57kg thought it was just15m from them, but those who weighed about 146kg saw it as being 30m away.

 So far from being crazy. Overweight people simply see the world differently when thinking about exercise. The heavy weight can feel like a load (装载物) to carry.

"If you find yourself out hiking with a heavy backpack, hills are going to seem steeper, distances are going to look farther, a gap across a river are going to look bigger." Jessica Witt from Colorado State University told the Guardian.

 It's this idea that if you have to make more of an effort to climb that hill because you are carrying this heavy backpack, the hill is going to look more challenging.

"You are not seeing that hill as it is. You are seeing the world through your ability to act. You have less ability because you are having to carry this backpack." Witt said.