Teachers are important to students at school. They help students improve their studies in many ways. Some students like men teachers and others like women teachers. It was lucky for the students in some schools in South Korea（南朝鲜）. They had special teachers—robot teachers.

“Robot teachers never get angry or speak unpleasant（使人不愉快的）words. They are popular among the students in some South Korean schools,” a reporter said.

The students were glad to answer the robot teachers’ questions in class. Scientists sent English teaching robots to three schools for eight weeks’ teaching and robot teachers teaching math science and art went to five schools in Seoul（首尔）.

Scientists found that the English-teaching robots made the students become more interested in the language and more confident of themselves.

Scientists said that sending robot teachers to schools was helpful to the children in the countryside. They could learn a lot like the students in the city in this way.

The students were interested in studying when robot teachers gave lessons to them. They also became more creative. Scientists were trying to make robot teachers better. What will the students be like if their teachers are all robot teachers? Let’s wait and see.

The Hexa Plant is a six-legged robot that has been specially made to care for the potted (盆栽的) plant that it carries on top of its head. Using light and heat sensors (传感器), the robot has the ability to carry its plant in and out of the daylight. If the houseplant needs more sun, the Hexa will walk into the sunlight; if the houseplant is getting too hot, the Hexa will go back into the area that blocks direct light. The Hexa Plant will even do a little dance when it senses that the plant needs to be watered to warn its owner.

The robot was developed by the Vincross engineer and founder Sun Tianqi after he saw a dead sunflower siting in the darkness in a room back. “Plants only receive an action without responding,”Sun Tianqi wrote in a blog post. “Whether they are being cut, bitten, burned or pulled from the earth, or when they haven’t received enough sunshine, water, or are too hot or cold, they will hold still and take whatever is happening to them.”

According to Sun Tianqi, for billions of years, plants have never experienced movement of any kind, not even the simplest movement. In their whole lives, they stick to where they were born. Sun Tiangi continued, “Do they want to break their own settings or have a tendency (趋势) towards this? I do not know the answer, but I would love to try to share some of this human tendency and technology with plants. With the help of the robot, plants can experience the move.”

The Hexa Plant model robots are not for sale, though Vincross does sell a Hexa robot model. It is said that in the near future the robots can open up a new market to watch over our household plants.