There is definitely a natural declinein short-term memory and learning ability with age, and it seems to be a slow, progressive decline. some of the neurons in the brain die off.
In fact, recent studies have shown that a globaldecline in mental function with age is not at all inevitable.
We can “replace” old or dead neurons by using steem cells
* How might fat cells be able to help people with spinal cord injuries?They look like nerve cells, and even act like them for a short time.
In fact, scientists at Duke University Medical Center and a company called Artecel Sciences Inc. think the cells they recently"grew" out of fat tissue left over from liposuction procedures could actually be nerve cells.
Human nerve cells are incapable of regrowing on their own. Right now, people suffering from spinal cordinjuries, stroke, Alzheimer's disease and other conditions that involve death or damage to the neurons have no way of recovering. but these cells are usually embryonic cells or a very rare populationof true neural stem cells from deep in the brain, and both are impractical for clinical use
* How are frog eggs being used in research involving human cells?
Immature frog eggs canrejuvenate adult human cells. Molecules in the amphibian nucleus coax mature human and mouse DNA back to an adaptable, stem-cell-like state.
With this humans can continue evolving in a faster way.
Astem cell is a "generic" cell that can make exact copies of itself indefinitely. In addition, a stem cell has the ability to produce specialized cells for various tissues in the body -- such as heartmuscle, brain tissue, and liver tissue. Scientists are able to maintain stem cells forever, developing them into specialized cells as needed.
* What are Schwann cells? How are they...