Born in a peasant family, he lived in extreme poverty since childhood, worked as a middle school teacher, and taught himself in his spare time. In 12 years, he successively obtained a bachelor's degree, a double bachelor's degree and a doctor's degree, worked hard in middle school for more than 20 years, observed and studied insects and plants in his spare time, and published excellent papers. However, his dream of "boarding the university platform" has never been realized, and his desire to open an independent entomology laboratory has never been supported.
Nikola Tesla
Inventor of alternating current, the most jealous genius in history. We all know Edison, but Edison is just a businessman, and many of his inventions are not his own efforts. Only later, they all applied for patents in his name. He is a great man forgotten by the world. He invented the alternator, and Edison loved the DC generator he invented and tried his best to suppress Tesla. Tesla would be the richest man in the world if it hadn't been forced to give up the patent for free use of alternating current ($2.53 per horsepower). His dream is to provide inexhaustible energy for the world. Tesla never cared about his financial situation and died of poverty and forgetfulness at the age of 86. Although he is a peerless genius, unfortunately not many people remember him.
Morse code
He invented a new telegraph system, which used intermittent current to send text messages. In this way, only one wire is needed to send a telegram, and the earth is used as another current path. Morse used two kinds of current signals with different durations to form different time series, representing different Latin letters and Arabic numerals respectively. The intermittent current signal sent by the transmitter flows through the electromagnet coil on the receiver through a long wire, and the iron sheet is intermittently attracted by the ticking sound, and the opening and closing time of the iron sheet is completely consistent with the signal sent by the transmitter. If a pencil is tied to the iron sheet and 1 paper tape is driven by the clock mechanism to pass under the pencil at a uniform speed, the paper tape will clearly leave the combined handwriting of dots and lines sent by the telegraph operator, and the translator can interpret the contents of the letter accordingly. At that time, this telegraph machine could send 10 words per minute.