In the 1950s, to safeguard national security and uphold world peace, China decided to develop atomic bombs, missiles, and artificial earth satellites, striving to break through cutting-edge defense technologies. This book recounts a story where a child accidentally discovers in his grandmother’s diary that his grandfather, grandmother, and father participated in the tests of atomic and hydrogen bombs. Through the touching tale of one small family, it encapsulates the selfless dedication of hundreds of families over decades, and witnesses the monumental “Two Bombs, One Satellite” endeavor through the innocent eyes of a child.