Nikola Tesla was a controversial historical figure who was considered one of the greatest inventor in human history. However, he was less known by people, which may be due to the following reasons: 1 The Light of Eden: Nikola Tesla and Thomas Eden were two controversial historical figures who both made important contributions to modern technology. However, due to the greater influence of Thomas Eden, his inventions were more well-known, so Tesla was relatively neglected. 2. Restrictions of scientific research: Although Tesla was an outstanding scientist and inventor, his scientific research was limited by many scientific research. These limitations made it difficult for his invention to be proven and made it difficult for people to understand his true contribution. 3. Political interference: Tesla was once an independent scientist and inventor, but he later became a member of the American Society of Electric engineers, which increased his political status and influence. This also made it easier for his invention to be controlled and used by the US government. In summary, although Nikola Tesla was an outstanding scientist and inventor, his influence and popularity were relatively low due to the above reasons.