Make NGSS come alive with this 3rd grade science story about heartbreak, invention, and the invisible forces that changed how the world communicates. Aligned to 3-PS2-3, The Telegraph That Changed the World is a narrative science lesson about Samuel Morse’s invention of the telegraph — a machine that used electric currents to activate magnets and send messages across great distances, without any physical contact. This Story: The Telegraph That Changed the World Standard: 3-PS2-3 Students expl