Lactose intolerance is an impaired ability to digest lactose, a sugar found in dairy products. Only one-third of people produce the lactose enzyme during adulthood, which enables them to drink milk.
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Read MoreThe busiest ship traffic areas in the world are typically concentrated around major ports, waterways, and strategic maritime routes. The map below shows areas that experience high volumes of vessels, ranging from cargo ships and tankers to cruise liners and fishing boats.
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The best film of each country in Europe The worst film of each country in Europe
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