Health
How the puzzle of viral vector vaccines was solved, leading to today’s COVID-19 shots – Medical Xpress
How would you go about solving a puzzle if you didn’t know what pieces to use, how many you would need, how it was supposed to…

How would you go about solving a puzzle if you didn’t know what pieces to use, how many you would need, how it was supposed to look when you were done or what possible function it would serve?
Such a challenge faced Frank Graham in 1969 when he was a Canadian…
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