With no cure for Covid-19 virus found yet, the rapid mutation rate, contagious and infectious, the world's answer to stop the pandemic was to develop a vaccine for it.  Vaccines were developed at the speed of light, within a year compared to the norm of 10 to 15 years.  Not just with the conventional used of de-activated virus but another technology in the form of mRNA was also deployed.  So the answer the world has to stop Covid-19 pandemic or to make it an endemic instead is through herd immunity via vaccination.  The initial target of at least 70% of the population being vaccinated means achieving herd immunity.  This is the narrative so far but it just leaves too many questions with no concrete answers if anyone cares to do a deep analysis into it. Firstly, let goes through some background.  Since the Spanish Flu in 1918 till now, the noticeable...