The Missing Links: How A Typo Led to NORAD Tracking Santa

The North American Aerospace Defense Command (NORAD) started tracking the flight of Santa’s sleigh back in 1955—all because of a typo.

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Here are the 10 science headlines that defined 2015.

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Intriguing Headline of the Day: You Can Actually Hear the Climate Changing

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Everyone should learn sign language. You never know when you're going to need it. 

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This couple willingly swallowed 10 milligrams of DDT every day for lunch for more than 3 months.

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Please allow Bill Nye to explain your dreams with emojis.

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Virtual reality now lets you practice with the New England Patriots. As long as you're one of these 10,000 lucky fans. 

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Darth Vader Cat is Internet gold.