4 . A few months ago, a friend gifted me a robot sweeper that’s programmed to move around a room and clean as it goes.

When the box arrived, I was afraid the device would detect me and suck up (汲取) data along with the dog hair and dust. But the instructions were easy, and I finally decided not to care.

I powered up the sweeper, watched it leave its docking station to work, and quickly fell in love with my newly shiny floors. I kept shooting its working videos. “I think you’re giving more attention to it than to us,” joked my son.

One day, I returned home and discovered that our front door had blown open and the robot rolled into the yard, trying to clean the flower beds. Even when its brushes were blocked with leaves, bugs and mud, its little wheels bravely kept turning.

The robot acted properly as it was programmed to clean “dirty” things. In a kitchen, dirt can be garden debris (碎片) such as leaves and mud. In a garden, this kind of dirt does not need to be removed. The context is important. The problem for robots is that reading this context is difficult.

This accident inspired me to think more about AI (artificial intelligence). As far as I am concerned, AI is simply well trained and reproduces what it has learned. And it is undeniable that robots are increasingly being given powerful intelligence. Some experts even predict that we will soon see not only AI-enabled robots designed to solve problems according to their instructions, but also those with the ability to judge how they should respond when they are in a different setting.

Maybe this will happen in the near future.

5 . Public Speaking Courses

Complete Public Speaking Masterclass for Every Occasion (Udemy)

If you’re struggling to put yourself out in front of audiences, then joining this Udemy course will be a good decision. In this course, you will be instructed to feel calm and comfortable on stage in front of any number of people while speaking and conveying your message. The comprehensive guide by TJ Walker will help you impress your audience and influence them.

Dynamic Public Speaking Certification (证明) by University of Washington (Coursera)

Available on Coursera, this online course is perfect for people who want to be excellent dynamic speakers. You will be taught by Dr. Matt McGarrity - a principal lecturer at UW Department of Communication. Designed for beginners, it will help you gain many skills, for instance, public speaking, speech, presentation, and communication.

How to Become a World-class Speaker (Mindvalley)

This Mindvalley course is aimed at training people who have no experience of public speaking and just start to set foot in this area. It has already assisted a lot of people in becoming skillful at speaking and spreading their voice. Lisa Nicholas, your communication coach, is regarded as one of the best speechmakers in the world. Within less than two days, you will get insights into how she masters this art.

Effective Communication: Writing, Design, and Presentation (University of Colorado Boulder)

With the help of this course, you can get better at business communication, including presenting your ideas to your coworkers, handling client (客户) calls, and so on. You’ll also learn how to write effective business emails, along with reports and draft presentations. This course is very popular among people who want to quickly fit in with the workplace.

6 . Test anxiety exists and is a common problem among students.     1     . When you’re stressed and anxious during an exam, your mind has a tendency to go completely blank. Here are some tips on how to reduce or overcome test anxiety.

Get to know the material

First, you need to know the topic of the exam.     2     . Knowing as much as possible about the material can get you ready for the test. As to any exam, learn your material thoroughly. Memorize what needs to be memorized and understand what needs to be understood.

Slow down and calm yourself

    3     . So when the test starts, rather than immediately jumping to answer the questions, relax first to get your mind to work. Wait for the class to settle down before you start answering. Saying a few words of encouragement and conscious breathing can help you calm yourself down.

    4    

If you have an hour for an exam, try to consume every second of that hour in answering the best possible choice. There are no rewards for finishing first!

Silence unwanted pressures

Believe it or not, chances are that other students can be a source of major anxiety during the test. Seeing them cramming (恶补), telling you what you need to remember and what might show up in the exam will affect your preparation. Get past through the negative and unwanted thoughts and remind yourself of how well you know about the topic. Avoid speaking with any fellow classmates who are not prepared and who express negativity.     5     .

7 . “Given that signs of Alzheimer’s disease (老年痴呆症) start to accumulate in the brain several decades before the disease begins, understanding the connection between sleep and cognition (认知) earlier in life is critical for understanding the role of sleep problems as a risk factor for the disease,” said study author Yue Leng, PhD, of the University of California, San Francisco.

The study involved 526 people with an average age of 40. They were followed for 11 years. Researchers looked at participants’ sleep duration and quality. Participants wore a wrist activity monitor for three continuous days on two occasions approximately one year apart to calculate their averages. Participants slept for an average of six hours. Participants also reported bedtime and wake-up time in a sleep diary and completed a sleep quality survey with scores ranging from 0 to 21. A total of 239 people reported poor sleep with a score greater than five.

Researchers also looked at sleep fragmentation (碎片化), a measure of restlessness during the sleep period expressed as a percentage. The higher the value, the more sleep is interrupted. Participants were divided into three groups based on their sleep fragmentation score. Of the 175 people with the most interrupted sleep, 44 had poor cognitive performance 10 years later, compared to 10 of the 176 people with the least interrupted sleep.

After adjusting for age, sex, race, and education, people who had the most interrupted sleep had more than twice the possibility of having poor cognitive performance when compared to those with the least interrupted sleep. There was no difference in cognitive performance at midlife for those in the middle group compared to the group with the least interrupted sleep.

However, due to the small sample size, the researchers were unable to fully investigate potential race or sex differences. “More research is needed to assess the link between sleep disturbances and cognition at different life stages and to identify if critical life periods exist when sleep is more strongly associated with cognition,” Leng said.