green clothes, green shamrocks, green beer and green rivers. So my students are often surprised when I tell them that St. Patrick’s Day was once a solemn feast day when you’d be far more ...

Now that you know what the Purkinje Effect really is, you might still wonder about its connection with red and green clothes. During the eclipse phase, when the transition from a brightly lit ...

St. Patrick’s Day usually conjures images of partying, Catholicism, Irish nationalism and, perhaps most famously, the color green: green clothes, green shamrocks, green beer and green rivers.