Be vigilant...How to strengthen your brain abilities? It reaches a peak in intelligence, memory and creativity

"Be vigilant"... two words that form a sentence, the purpose of which is advice, not command. The author Dale Carnegie is not accustomed to ordering his reader, but rather he is accustomed to having a friend sit with him, who gives him a summary of his experiences and expertise, and gives him advice, so he takes the two words as the main title of the book and then follows it. With a long and expla...