english: And the key reason we were able to it was not only rising incomes but also a few key breakthroughs: vaccines that were used more widely.
non_english: A kľúčovým faktorom, prečo sme to dokázali, nebol iba rast príjmov, ale tiež niekoľko objavov. Vakcíny, ktoré se začali oveľa viac používať.