The enormous Rockefeller tree may be a sight to behold, but how does it compare with its little cousins, the regular Christmas trees that decorate people's homes?
All mammals nourish their young with milk, but fat content is one aspect of mothers' milk that can differ greatly from species to species.
Here's a look at the wild history of your favorite Halloween monsters, from vampires and zombies to ghosts and gargoyles.
Map showing countries that have reported virus transmission, cases of the virus, or historical cases prior to 2015.
In the 20th century, researchers realized that the Earth's crust is not one piece, but is made up of many huge tectonic plates upon which the continents ride.
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