**“Altogether
the total number of ****connections in the human
brain ****approaches 10****15**** or a thousand million ****million.
Numbers in the order of 10****15**** are of ****course
completely beyond comprehension. ****Imagine an area about
half the size of the ****USA (one million square
miles) covered in a ****forest of trees
containing ten thousand ****trees per square mile. If
each tree contained ****one hundred thousand
leaves the total ****number of leaves in the
forest would be ****10****15****, ****equivalent to the
number of ****connections in the human brain!****”**