Scientists have scant idea of why we sleep, and find dreaming an even bigger mystery. Theories range from – the brain cleaning its memory of junk to the liberation of suppressed subconscious urges. The reason for their ignorance lies in the astonishing design of the brain. The most complex known object in the universe, it contains as many nerve cells – neurons – as there are stars in the milky way; about 100 billions of them. Each communicates with thousands of its neighbouring neurons generating an unimaginable complex process. Questions: a) What two things pose a mystery to scientists? b) How do some theories explain this? c) Why are the scientists astonished about the brain? d) What are these nerve cells known as?
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1) the two things that pose a mystery to science are why we sleep and why we dream.
2) theories range from _ the brain cleaning its memoryof junk the liberation of suppressed subconsious urges..
3)because there are as many nerve cells as there are stars in the milky way. Almost about a hundred billion.
4) these nerve cells are known as neurons.
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