భారత జాతీయపతాకం
భారత జాతీయ పతాకాన్ని రూపొందించింది ఆంధ్రుడైన పింగళి వెంకయ్య. జాతీయపతాకాన్ని ఖాదీ బట్టతో మాత్రమే చేయాలని జాతీయపతాక నిబంధనలు తెలియజేస్తున్నాయి. పతాకావిష్కరణ, వాడకాల గురించి కచ్చితమైన నియమావళి]] అమల్లో ఉంది.
నికోలా టెస్లా
When Tesla was 36 years old, the first patents concerning the polyphase power system were granted. He continued research of the system and rotating magnetic field principles. It is curious that Nikola Tesla, a pioneer of AC systems, was born approximately 100 km north of Šibenik where the first power plant in Croatia was constructed. It may be a coincidence that in May 1892, Tesla held a lecture on alternating systems in the City Hall of Zagreb (the capital of Croatia) at the time of the beginning of the preparations to construct the Jaruga I hydroelectric power plant. Tesla served, from 1892 to 1894, as the vice president of the American Institute of Electrical Engineers, the forerunner (along with the Institute of Radio Engineers) of the modern-day IEEE. From 1893 to 1895, he investigated high frequency alternating currents. He generated AC of one million volts using a conical Tesla coil and investigated the "skin effect" in conductors, designed tuned circuits, invented a machine for inducing sleep, cordless gas discharge lamps, and transmitted electromagnetic energy without wires, building the first radio transmitter. In St. Louis, Missouri, Tesla made a demonstration related to radio communication in 1893. Addressing the Franklin Institute in Philadelphia, Pennsylvania and the National Electric Light Association, he described and demonstrated in detail its principles. Tesla's demonstrations were written about widely through various media outlets. Tesla also investigated harvesting energy that is present throughout space. He believed that it was just merely a question of time when men will succeed in attaching their machinery to the very wheelwork of nature, stating:
At the 1893 World's Fair, the World's Columbian Exposition in Chicago, an international exposition was held which for the first time devoted a building to electrical exhibits. It was a historic event as Tesla and George Westinghouse introduced visitors to AC power by using it to illuminate the Exposition. On display were Tesla's fluorescent lamps and single node bulbs. An observer noted: 
Tesla also explained the principles of the rotating magnetic field and induction motor by demonstrating how to make an egg made of copper stand on end in his demonstration of the device he constructed known as the ""Egg of Columbus"".