1+1=2 2+2=4 4+4=8. 8+8=16
Explanation:
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I don't have time but some good starting points are Piaget's theory of development and Erik Erikson's chart.
Answer: This was curious, because during so-called REM sleep (rapid eye movement), our muscles are usually paralysed. Researchers realised that inducing a similar state in animals could allow them to probe how they dream.
Explanation: