Signs You Might Be Dehydrated(脱水的)

Dehydration is a big problem in the summer months. Unfortunately, knowing when you begin to dehydrate isn’t always easy. So, as summer heats up, here are a few secret signs that you need to drink as soon as possible.

Your breath smells or your mouth is dry. There is a potential relationship that links dehydration and less than-pleasant breath, When you're dehydrated, you don't produce as much saliva(唾液).【小题1】So if you notice your breath is a little smelly, it could be a red flag that you need to drink a glass or two of H₂O.

【小题2】Dehydration can actually temporarily shrink brain tissue, and that shrinkage may cau se pain. Such pain is a really common sign of slight to middle dehydration, and it can be either tolerable or serious.

Your pee（尿液）is dark. One way health professionals diagnose dehydration is by testing a patient’s pee to see if it's too concentrated. But it can also help to do an easy check at home. Simply look at the color of your pee. If it’s pale yellow, you’re hydrated. If it's a darker yellow, it’s time for a glass of water.【小题3】

You’re hungry. Thirst and hunger signs always come together.【小题4】So if you find that you’re feeling hungry soon after eating, it’s worth considering whether the real reason is thirst.

【小题5】Staying hydrated is a really key part of maintaining energy throughout the day. Not getting enough water to support the body to do their functions can make you feel like you’re dragging. Plus, hydration can have a direct effect on sleep quality.

Color can affect moods, emotions and even actions. This includes sleep and health. In ancient cultures, color therapy is even used as a method of healing.

The color blue has been thought to stimulate (促进) a sleep state. Exposure to blue light can help lower body temperature and blood pressure. A decrease in blood pressure and body temperature is the preparation that signals to the body that it’s time to sleep. Therefore, seeing the color blue when you are ready to rest may cause the response and help you fall asleep more easily.

While there is much evidence that blue is the best choice for your bedroom walls, it’s really the tone that influences your sleep, not the color itself. Deep blue or other neutral (中性的) tones will even make a small bedroom seem more spacious.

While soft colors and earth tones are the most calming and restful bedroom colors for sleep, bright colors prevent your brain activity. These colors stimulate brain activity and stop you from falling asleep. While many parents paint their children’s rooms with bright colors, it’s better to choose fun, playful colors in gentle tones to encourage their kids to go to sleep. Light yellow, green and blue are all amazing choices to paint your children’s bedroom.

What you should remember is that never paint your bedroom walls purple! Purple stimulates creative thought and can lead to extremely vivid nightmares. Other bad choices for bedroom colors include bright reds and bright oranges. These colors stimulate the brain and increase energy. For example, red causes passion, increases energy and may even help you move more quickly. It may be a better choice for your home gym than for your sleep space.

Regardless of the size of your room, there are a few tones that we suggest for creating a healthy space for deep sleep. The most important factor is that you feel relaxed, calm and restful in the room. You should also keep your bedroom free from mess as much as possible and keep it clean. In your bedroom, sleep should be your main focus.

You may not want to hear this, but Crabtree believes that human intelligence reached its peak more than 2,000 years ago and ever since then has been going downhill. “If an average Greek from 1,000 BC were transported to modern times, he or she would be one of the brightest among us,” Crabtree told The Guardian.

At the heart of Crabtree’s thinking is a simple idea. In the past, intelligence was critical for survival when our ancestors had to avoid dangerous animals and hunt for food. The difference of being smart or stupid is often life or death. However, after the spread of agriculture, when our ancestors began to live in dense (稠密的) farming communities, the need to keep their intelligence in peak condition gradually reduced.

This is not hard to understand. Most of the time, pressure is what keeps us going—you need the pressure from your teachers to finish your homework; the pressure of looking pretty prompts you to lose weight when summer comes. And the same is also true of our intelligence—if we think less, we become less smart.

These mutations (变异) are harmful to our intelligence and they were all developed in the past 3,000 years. The other evidence that Crabtree holds is in our genes. He found that among the 2,000 to 5,000 genes that we have that determine human intelligence there are two or more mutations in each of us.

However, Crabtree’s theory has been criticized by some who say that early humans may have better hunting and surviving abilities, but people today have developed a more diverse intelligence. For example, spearing a tiger doesn’t necessarily require more brainpower than playing chess or writing a poem. Moreover, the power of modern education means a lot more people have the opportunity to learn nowadays.

“You wouldn’t get Stephen Hawking 2,000 years ago. He just wouldn’t exist,” Thomas Hills of the University of Warwick, UK, told Live Science. “But now we have people of his intellectual (智力的) capacity doing things and making insights that we would never have achieved in our environment of evolutionary adaptation.”