Answer: Cell division in human body
Notes: Biomedical researcher Leonard Hayflick, who discovered the "Hayflick limit," recently passed away. "Hayflick limit" refers to the maximum number of times a cell can divide. This discovery is crucial for understanding aging and age-related diseases. Hayflick identified three phases of cell division: rapid division, slowing mitosis, and senescence, where cells stop dividing. After cells stop dividing, they eventually undergo programmed death, called apoptosis. In the 1970s, researchers found that telomeres, protective DNA sequences at chromosome ends, shorten with each division, eventually leading to the end of cell division. The exact link between telomere length and lifespan remains unclear.
