Knowledge Matrix on Instagram: "Morse code began in 1837 when Samuel Morse introduced a system of short and long signals for telegraph lines. It expanded fast during the 1840s as rail networks and telegram traffic grew. International standards appeared in 1865 with a unified set of symbols. Radio operators adopted the system in the early 1900s because short signals traveled far with little equipment. Aircraft navigation beacons started sending identifiers in the 1920s. Marine emergency traffic a