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The human brain controls every action, thought, and process of the body; but what makes the brain function? A network of nearly 100 billion individual cells called neurons or nerve cells, allows the brain to think, remember, hear a symphony, enjoy a sunset, love and imagine. Neurons tell our bodies to move, breathe and create.
大腦掌控者人體的每一個動作、思想和過程；但是又是什么讓大腦行使職責呢？由大約1000億個單個個體（叫做“神經元”或“神經細胞”）組成的細胞網讓大腦能夠思想，記憶，聽到交響樂，享受日落，愛和想象。神經元告訴我們的身體去移動、呼吸和創造。
The amazing network of neurons that forms the human brain makes it the most complicated brain on the planet.The complexity of the brain, not its size, accounts for its capacity. Dolphins, whales and elephants have larger brains, though in proportion to our body size, ours is the largest. Among humans it appears that brain size doesn't affect intelligence.
組成人體大腦的神奇神經元網使之成為地球上最復雜的大腦。大腦之所以復雜不是在它的大小，而是在它的才能。海豚，鯨魚和大象的大腦大小都比人類的大，但是比大腦和身體大小的比值，我們人類是最大的。在人類中大腦的大小并不影響智力。
An investigation of Einstein's brain after his death revealed that his brain was no larger than anyone else's.Given the brain's complexity, it requires a highly developed system of communication in order to coordinate all of its neurons. This system is based on electrochemical impulses. Like a computer, these impulses travel along circuits. Unlike computers, these signals are created chemically.
愛因斯坦死后對他大腦的調查顯示他的大腦不比其他人的大。考慮到大腦的復雜性，大腦需要高度發達的交流系統來協調所有的神經元。這個系統是以電化學沖動為基礎的。跟電腦一樣，這些沖動在回路間傳導。跟電腦不一樣的是，這些沖動信號是化學反應產生的。
These chemical transmissions are called neurotransmitters, and they are responsible for the incredibly rapid communication between neurons. Just imagine how quickly you feel happy after hearing good news. The speed and accuracy of these neurotransmissions are what let us react to the world around us, and ultimately, to survive.
這些化學傳播物質叫做神經遞質，它們負責神經元之間不可思議地快速的交流。想象一下當聽到好消息后你是多快感到高興吧。神經傳遞的快速精準讓我們能對周圍世界產生反應，最終使我們得以生存。
