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"The object of physics research is everything in the universe, so physics is the principle of everything." In the shared space on the first floor of Beijing Book Building, Ma Boqiang, a professor at the School of Physics of Peking University, moved a lecture titled "From Particles to the Universe" from the classroom of a higher education institution to the "Sanwei Book House" in this downtown area. Facing the large audience of four stages, old, middle-aged, young and young, Professor Ma laughed and said that he did not expect so many "students" to come to listen to the physics lecture.

From the microscopic to the macroscopic, physics studies the principles of all things.

"Physics seeks to describe the laws of motion followed by all things in the universe in a unified and simple language, and to reveal their structures and interactions." A basic question that humans are concerned about is "What is the world made of?" Ma Boqiang raised the question and then sorted it out: "Two thousand years ago, Chinese and ancient Greek philosophers both gave their own answers to this question. In ancient China, we believed that the world is made up of five elements, namely gold, wood, water, fire, and earth; ancient Greece also had the four-element theory of 'earth, fire, air, and water'. Another theory, 'atomic theory', was first proposed by the ancient Greek philosopher Leucippus, and was further developed by his student Democritus to form the earliest simple atomic theory in Europe."