Spelling this out slowly for the reflexive downvoters, ACT test scores began their decline well before any widespread use of mRNA COVID vaccines which would make them extremely novel in their endochronicity if they had an effect before they were used.
Otherwise, as pointed out by lostlogin, mRNA vaccines have been used in humans since 2013 and studied in animals since 1989 which makes them less novel than widely claimed.
Otherwise, as pointed out by lostlogin, mRNA vaccines have been used in humans since 2013 and studied in animals since 1989 which makes them less novel than widely claimed.