The cells of our nervous system (the ones found in our spinal cords and brains) can not regenerate themselves once matured. This very often means that people who damage their nervous system in an accident, end up paralyzed with no hope of regaining their ability to feel or walk again. But fret not! Some researchers have found a gel that spurs the regeneration of these cells. It works by filling the space between existing cells, and encouraging new cells to grow. This technology can potentially eliminate paralysis and brain damage altogether. There have also been developed a biodegradable nanosphere that transports cells into wounds, to speed up regeneration of tissue.