Humans have searched for immortality for as long as history has been recorded, yet biology tells a different story. This video explores the scientific reality of why the human body cannot last forever, breaking down the cellular and genetic limits that define our lifespan. From the moment you are born, your cells are dividing, repairing, and slowly accumulating damage. Structures called telomeres shorten over time, DNA errors build up, and eventually cells lose their ability to function properly. These processes are not accidents, but natural consequences of being a living organism governed by chemistry and physics.

You’ll also learn about the discovery of the Hayflick limit by Leonard Hayflick, which revealed that human cells can only divide a finite number of times. The video connects these microscopic limits to the bigger picture of agin ...