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Every year, Santa Claus brings gifts to nearly 600 million children on Christmas Eve. Let's see what physical facts make his job harder.
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This animation compares a modern living room and a typical bourgeois salon.
The Earth is a rocky planet with a solid crust and oxygen in its atmosphere.
The system of circles of latitude and longitude on the globe enable every location on the Earth to be exactly specified.
Reindeer are the northernmost deer species.
This animation shows the hierarchical structure of the Medieval Christian church.