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人们常从报刊杂志上看到一些古稀老人白发变黑、重长新牙的消息。人类当真能返老还童吗科学家的解释如今，科学家们十分关注返老还童原理的研究。关于头发的更新，专家们是这样认为的：头发的颜色是由毛发中的色素细胞决定的。色素细胞产生的色素颗粒，会使人的头发乌黑发亮。?
People often read newspapers and magazines, some old thin black hair, heavy long teeth. Can humans really be rehabilitated? Scientists explain Today, scientists are very concerned about the principle of rejuvenation. As for hair renewal, experts think so: the color of hair is determined by the pigment cells in the hair. Pigment cells produce pigment particles, will make people’s hair shiny black hair. ?