In this episode, we explore the groundbreaking invention of the seismoscope by Zhang Heng in 132 CE, a revolutionary tool designed to detect distant earthquakes. We delve into its curious design, which featured decorated dragons and toads, and the ingenious mechanism that allowed it to alert communities to seismic activity. Highlighting its historical significance, we discuss its effectiveness as evidenced by its early detection of an earthquake in Gansu Province, and how the seismoscope's influence spread along the Silk Road, inspiring similar devices across cultures.