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Presently, there are certain theories on aging. Actually, we do not have till now an exact scientific clarification for aging. We only know that our body is designed to age and grow old. There are seven major theories about why we age. All of them have some credibility. The first theory is, our genes have been programmed to divide into a particular number of times and as soon as this division reaches the maximum allowed number our body will start to grow old and begin to fail. This is known as Telomar Theory. Actually these are hereditary genetic elements that are controlling the number of allowable cell divisions.

The second theory is the general degeneration of neuroendocrine system. Our bodies’ neurological and hormonal systems that regulate the functioning of our body lastly wear out and make us venerable to a host of disease causing factors. The third is equally correctly stated that our body builds up a lot of toxins and other desecrate products and which is why our systems begin to shut itself down.

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From understanding climate change to predicting infectious disease outbreaks to engineering solutions to address disability, scientific research is increasingly crossing the boundaries between disciplines. Fostering interdisciplinary research, education and training as a means of developing the next generation of scientists is a key goal of the National Science Foundation's (NSF) Integrative Graduate Education Research Traineeship (IGERT) program.
MIT Identifies Cells For Spinal-Cord Repair - Could Lead To Non-Surgical Treatment For Injuries
A researcher at MIT's Picower Institute for Learning and Memory has pinpointed stem cells within the spinal cord that, if persuaded to differentiate into more healing cells and fewer scarring cells following an injury, may lead to a new, non-surgical treatment for debilitating spinal-cord injuries.