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Nikola Tesla, a Serbian American, was a major contributor to the start of the electric age, which transformed daily life at the turn of the 20th century. His inventions, patents, and theoretical work formed the basis of the modern AC electricity system. Meanwhile, his inventive genius led to the development of the radio, the television, and the modern world as we know it. Tesla was one of America's first celebrity scientists, much like his competitor Thomas Edison.

Edwin Hubble was a man ahead of his time. For him only astronomy really mattered. He took advantage of the opportunity given to him to use the most advanced telescope of his time to determine the truth behind the most distant clouds of light visible to Earth-based observers. His major discoveries changed our knowledge of our place in the universe forever. His determination that the universe is expanding served as the foundation for the big bang theory.