Buzz, buzz, I Ty around your bed at night. Oh, let me give you a “kiss”! You feel itchy. You wake up and you scratch（挠）, scratch... The next morning you are late for school.

What kind of people do I like to bite?

Mosquitoes are more likely to（更可能地）bite people with type O blood（O型血）. Did you hear people say this before? It's not true! In fact, I can't tell which blood type you are. Only doctors can do that well then, how do I choose（选择）?

Sweat（汗）

I find food by smelling（闻）. You play outside and start sweating all over. I can smell the lactic acid（乳酸）in your sweat. So yummy! But if you take a shower after exercising. I can't smell you.

Color

I also use my eyes to find food. But my eyesight is not very good. If you are trying to avoid me, do not wear colors such us black, red or dark blue.

Larger and fatter

I can smell the carbon dioxide （二氧化碳）. The more you exhale（呼出）, the more easily 1can find you This means Larger and fatter people are more likely to get my “kiss”.

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D．

Scientists who study happiness have evidence (证据) to show that being kind to others can result in happiness. Acts as simple as buying a cup of coffee for someone can lift a person’s mood, for example.

In studies, behavioral scientist Nicholas Epley and I examined a possible explanation: people who do kind acts underestimate (低估) how much the ones receiving kindness value their behavior.

In the experiments, about 1,000 people were asked to do some actions to make someone else feel good. We asked both the person performing the kind act and the one receiving it to answer some questions. The performers were asked to report their own experience and to guess how the receivers might feel. We wanted to understand how valuable people considered these acts to be, so both the performer and receiver had to rate how “big” the act seemed. In all cases, we compared the performer’s expectations of the receiver’s mood with the receiver’s actual experience.

For one, both performers and receivers experienced more positive moods. For another, the receivers felt much better than the kind performers expected. The receivers also rated these acts “bigger” than the people performing them did.

At first, we studied acts of the kindness done for familiar people, such as friends, classmates or family. But we found that performers underestimated their positive influences on strangers as well. In one experiment, performers in a public park gave away hot chocolate on a cold winter’s day to people that just happened to be nearby. Again, the kind act brought more happiness than the performers expected.

These findings suggest that what might seem small could matter a great deal to the person we do it for. Considering these warm actions can improve our own mood and brighter the day of another person, why not choose kindness when we can?

Attachment is not just a connection between two people; it´s a tie that involves a desire for regular contact with the person and the experience of pain during separation from that person.

According to psychologist John Bowlby, there are four critical characteristics of attachment. The first is the desire to be hear those with whom we share an attachment since we are happy while staying with them. Attachments also create a shelter, meaning that during times of pain, fear, or uncertainty, we may seek out the people we're attached to for care comfort. Next, attachment figures also offer a secure base for exploration. This is particularly important during childhood. This secure base allows kids to explore the world while they know they can still return to the safety of the attachment figure. Finally, we experience separation pain when parted from an attachment figure. For example, kids tend to become upset when parents have to leave them in the care of others.

Attachment serves a number of important purposes. For instance, it helps keep babies and children close to the caregivers so that they can avoid potential dangers, which in turn helps increase their chances of survival. However, if a child doesn’t form a secure attachment to a caregiver, he or she will suffer from a number of problems including conduct disorder and oppositional-defiant (对立反抗的) disorder. Researchers also suggest that the type of attachment displayed early in life can have a lasting effect on later adult relationships.

Psychologist Harry Harlow conducted an experiment on social isolation (孤立)   in   monkeys.   Baby monkeys were separated from their mothers and placed with surrogate mothers (代   母).One mother was simply a wire armature (支架) that held a bottle, while the other mother was   covered with a soft terry cloth material. Harlow found that the baby monkeys would receive food from the wire mother, but preferred to spend most of their time with the soft mother. When compared to monkeys that had been raised by their birth mothers, the monkeys raised by surrogate mothers were shyer and more nervous and suffered from social and emotional problems.

All in all, developing secure and healthy attachments early in life is very important. Such attachments play a vital rol1 our future development.