Darkness lined the alley to the mining field
Gloomy as his faith may be;
Had he been careful and wise indeed
He would not have fallen to this sea.
Life is a cycle; you may be up today, you know
Tomorrow you may be wallowing below.
Explanation:
polio vaccine was discovered by jonas saulk, 1953. order of events he had to follow / Saulk introduced the 1st vaccine with dead polio virus injected in humans, in 1953. 1st 2 introduce dead virus into humans, proved to be a substantial tool for vaccination of children and adults. proven to work, we use this vaccine today...
