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freshwater saltwater estuary
The freshwater found in rivers originates from rainwater and melting snow/ice. As this water flows downriver towards the ocean (or sea), it picks up trace amounts of minerals (including salt) from the earth (rocks, wood, etc.) and eventually empties them into the ocean. The...

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Why are horseshoes considered to be a sign of good luck?

Horseshoes are thought to bring good luck and safety. Over the centuries, several origin stories have emerged about why people believe the horseshoe brings...
Jason from Friday the 13th

Why is Friday the 13th considered to be unlucky?

No one knows for sure why Friday the 13th is considered unlucky but the most widely accepted explanation is based on Christianity.
Eye Bags

Why do we get bags under our eyes when we are tired?

There are two main reasons we get bags under our eyes when we are tired.First, when humans are tired, our skin gets dull and...
Fortnight

What is a fortnight?

The etymology of the word fortnight is rather bland. It’s short for “fourteen nights." More specifically, it comes from the Old English word, "fēowertīene niht,"...

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