On this week’s Please Explain feature, we investigate the expiration dates of different foods. We’ll look at the science behind "sell by" and "best by" dates with Dr. Susan Sumner, Director of the Department of Food Science and Technology at Virginia Tech, and Tod Marks, Senior Editor with Consumer Reports. They’ll tell us how to interpret all these food labels, and they'll tell us what happens if you drink a glass of expired milk. Then, Christopher de Bellaigue joins us for a nuanced portrait of the many political and cultural forces that have helped shape present-day Iran: In the Rose Garden of the Martyrs.
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