How Do You Know if You Can't Grow Your Hearts Back?

There is no certainty why we have lost that capacity. Part of the issue may simply be that we live longer. If you have cells that can readily regenerate, you also have cells that can more readily become cancerous because they have the chance to grow. So if youare a fish that's going to live two years, you may not spend much time worrying about cancer. But if you're a radio announcer who hopes to live ninety five years, you have to take it into consideration as someone who understands how sound in hearing works more intimately than ninety nine point nine per cent of the rest of the population. What? i was stupid in the nineteen sixties, but then so does everybody.