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What is a warm or cold front?

Writer/journalist/editor. His latest book, Breaking Down the Walls of...  · 12 декабря 2016
A warm front is the arrival of relatively warmer conditions, along with moisture and humidity, which is replacing the cold air as it moves around the planet. That begins the sequence of events which sees the cold front replace the warm front with the opposite conditions, namely colder... Читать далее
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Are there any foods that can fight flu and colds?

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Masha Budrytė