The Biggest Mystery Is the Brain, and the Heart Muscles

Carbon 14 is a radioactive isotope that was introduced to the atmosphere by humans and nuclear bombs. Carbon 14 decays at a constant ratey, i can tell you exactly how old the cellis Exactly. Eendat the biggest question has been the brain, specifically the cerebral cortex, and the heart, ind the heart muscles. But if you went back to prior to two thousand five, in doctor freeson's research, it was all a mystery.