Albert einstein was a famous, and probably the most well know one.
The western roman empire was weakened by the high cost of defending the empire.
At its zenith, the Roman empire stretched from the Middle East to the Atlantic Ocean. It being a vast territory, was not easy to govern and due to its vastness the empire faced logistical as well as administrative issues.
Even though they had excellent road systems, the Romans were still not able to effectively manage their territories. They had to struggle in order to maintain enough resources and troops so that they could defend themselves from the rebellions and outside attacks. Emperor Hadrian even constructed a wall in Britain so as to keep the enemies away.
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The answer to the given question is a coping strategy known as channeling your nervous energy.
Though you can choose to channel your nervous energy by keeping it to yourself, you can also exert it to your public speaking performance. Some ways of doing this include through creating interaction with your audience, speaking in a louder voice, and moving across the stage.
