When he first saw a map of malaria's range, Mann says it was as if the scales had fallen from my eyes. That range extends almost precisely to the Mason-Dixon Line, along which the American Civil War broke out in 1861, between the slave-holding states of the South and the Union soldiers of the North.
Opened yogurt will typically stay at peak quality for 5 to 7 days after opening, but will generally remain safe to consume for at least 1 to 2 weeks after the sell by date on the package, provided it has been properly stored- discard entire package if any sign of mold appears.
However, this date is usually a 'sell by' date, as mentioned above, and yogurt most often lasts for some time after this date - usually for 2 to 3 weeks after this date. Yogurt is made from milk which is pretreated to ensure that the only bacteria left in the yogurt are not harmful, and are simply 'good bacteria'.