What is the principle behind the levitation and drift of magnets in the air? What "secret weapon" does the "Struggler" have when it floats from ten thousand meters under the sea? From May 13th to 14th, the Chinese Academy of Sciences held the 19th Public Science Day in over a hundred research institutes across the country. Each institute combined its own research characteristics and launched scientific experience activities such as popular science dramas, open science classes, and scientific experiments. A large number of laboratories, botanical gardens, observatory stations, and large scientific installations are also open to the public. Without a drop of water, can the little yellow duck "swim" like in water? At the Institute of Process Engineering, Chinese Academy of Sciences, researchers demonstrated a magical teaching tool - a fluidized bed. When the gas path inside the fluidized bed is opened, the fine sand particles inside the bed will flow like water under the action of the airflow, and the little yellow ducks inside seem to be playing on the "water surface". Here, the scientific interactive small experiment has attracted many children to watch and participate. They not only do hands-on experiments, but also repeatedly ask questions to explore the scientific principles and knowledge behind the experiment. The colorful scientific experiments showcased the research direction and achievements of the institute to the public in a vivid and interesting way. Underwater biomimetic robotic fish, humanoid robots, non-contact video heart rate detection... The scientific display and interactive experience of the Institute of Automation of the Chinese Academy of Sciences showcases cutting-edge technological achievements in the field of artificial intelligence, vividly presenting the role and future application prospects of intelligent science in people's lives. The virtual human "Xiaochu" created by the institute based on the multi-modal large model "Zidong Taichu" with hundreds of billions of parameters, allows a large audience to stop and watch, and participate in interaction. Xiaochu is not only able to read pictures, understand videos, and understand sounds, but also able to continue writing in Chinese, translate bilingually, and recite poems and endowments. This vividly proves that through the correlation and collaboration of images, text, and speech, the understanding and generation ability of machines can be effectively improved, bringing AI closer to human imagination. Hydrophobic materials, liquid metals, superconducting magnetic levitation, sewage treatment magic hands... The Institute of Physics and Chemistry of the Chinese Academy of Sciences has become a "science park", where more than 30 scientific interactive experiments are performed, covering multiple disciplines such as photochemistry, biomimetic materials, low-temperature physics, and laser technology. The children who visited left messages: "I really enjoy these experiments," "The buoyancy materials are really amazing," and "I will come back again. Wang Shutao, Deputy Director of the Institute of Physics and Chemistry of the Chinese Academy of Sciences, pointed out that the biggest feature of the Institute's activities is scientific interactive experiments, hoping to plant the seeds of science in children's hearts through these experiments. Wearing VR glasses, you can "approach" proteins and observe them in person; The Intelligent Facial Sketchpad can create lifelike virtual humans with just a few strokes... The Institute of Computing, Chinese Academy of Sciences has changed its usual "high cold" style and transformed it into a "divine plan and clever calculation" amusement park this weekend. To attract more people to participate, the Computing Institute of the Chinese Academy of Sciences added popular science fiction content such as "Robot White", "Alpha Dog", and "Magic Mirror" to the public science day event, and launched science popularization games suitable for different age groups, enriching the forms of science popularization activities. At the Institute of Physics of the Chinese Academy of Sciences, academician lectures marked the stunning opening of the Public Science Day event. In the report 'Where did the ancestors of human ancestors come from', Chinese science