A simple British fisherman changed history. With only a signal lamp, he warned an entire convoy just in time — saving hundreds of lives during WW2. Sometimes, heroes come from the sea. #BritainAtWar #WW2 #HistoryShorts #TrueEvent #warstories | Britain At War

When radio communication between an aircraft and the control tower fails, air traffic controllers rely on a simple but highly reliable backup method known as gun light signals. From the control tower, the controller uses a powerful handheld signal lamp that projects a narrow beam of colored light toward the aircraft. Each color and flashing pattern has a specific meaning that pilots are trained to recognize. For example, a steady green light tells a pilot it is safe to land or take off, while a