Why Are There Locks on Some Canals and Rivers?
Locks are watertight chambers which enable boats to ascend or descend to different levels in a canal or river. The lock is usually rectangular in shape with gates at...
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Why Do My Ears Fill up When I Go up in an Airplane?
Why Do My Ears Fill up When I Go up in an Airplane? Your ears sometimes seem to “fill up” and may even hurt when you go up in an airplane. The chamber of...
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