Brain cells begin to work, multiplying more rapidly than other body cells. (Healy, Jane M., PhD. Your Child’s Growing Mind. p 12-14. NY:Doubleday, 1987, 1989.)

Three weeks after conception auditory neurons first appear. (Schwartz, Jeffrey M., MD, and Sharon Begley. The Mind & the Brain. p 124-125. NY:Regan Books, 2002.)

At some stages 250,000 new neurons are formed every minute. (Brynie, Faith Hickman. 101 Questions Your Brain Has Asked About Itself But Couldn’t Answer, Until Now. p 19-20. CT:Millbrook Press, 1998.)