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What causes metal allergies?

Why do some people become allergic to metals like nickel? (Image credit: Kinga Krzeminska via Getty Images) Metals are found in a variety of everyday items, from jewelry and kitchenware to doorknobs and hand tools. Some people may experience an…

Why does the date of Easter change every year?

It is sometimes claimed that Easter has pagan roots and uses symbolism associated with paganism, such as eggs and rabbits, but historians generally do not believe that it has pagan connections. (Image credit: Sarayut Thaneerat via Getty Images) Why does…