By Dr Rakesh Ayureshmi, Ayureshmi Ayurveda Wellness Centre, Kollam, Kerala, India The Hidden Invader That Became You Billions of years ago, an ancient invasion changed the course of evolution forever. A free-living bacterium entered another primitive cell—not to destroy it, but to live symbiotically. That microscopic act of collaboration became the foundation of complex life, including you. Every heartbeat, every breath, every movement is powered by this once-foreign invader