11.   Scientists in Sweden have identified for the first time the parent cells that give rise to many and maybe all of the different cell types in the adult brain.

12.   Scientists have discovered new nerve cells sprouting deep within the adult human brain, undercutting the ancient biological dogma that dead brain cells can never be replaced.

13.   Snyder believes that neural stem cell activity may be quite high in normal adult brains and even higher in diseased brains.

14.   Somehow those cells wired themselves into the fantastically organized complexity of the adult brain.

15.   The average adult human brain weighs about three pounds.

16.   The experiments show that the adult brain is capable of substantial change, even late in life.

17.   The recent discoveries that adult brains still contain some stem cells makes it possible to derive such cells from adults, which would remove the ethical questions.

18.   They shed light on how the adult brain changes, a phenomenon called plasticity, and on mechanisms that make it resistant to change.

19.   They show that the adult brain is capable of substantial change, even late in life, she said.

20.   This is the first evidence that healthy adult brains can alter depending on how they are used, which could lead to new treatment for injured or diseased brains.