I have been to science and technology museum of China in last summer. It is a really big museum to show how technology develops and how some really important machine works. And I learnt many knowledge about physic and chemical. It has many different parts for different topics. One of them is for vehicle. It taught us how car was invented and how it became more and more convenient. And the history of boat. Inventor found many kinds of material to build it. Now, people use it for transport and even make it more environmental.

 And there is also a part to show the technology in ancient time. You can compare the difference and improvement between modern technology and some old machine. Scientists try to change this world can be more convenient and save more energy. In my opinion, the most interesting thing is the history and development of watches. In the past, people use water pure into some cans or use the shadows to estimate the time. Now, we have different types of watches, and there are many tiny details and structures in it. So everything is changing and developing, although some simple things that we always use in usual life.

For us, we need to learn about these technology, and we may change this world in the future.