The Aztecs were the first to serve chocolate as a drink. They also mixed it with hot chili pepper to make it really 'hot'.
13
Not swinging your arms when you walk increases the effort of walking by 12%, the equivalent of walking 20% faster or carrying a 10 kg backpack.
12
The chills you sometimes feel when listening to music is called "musical frisson."
18
The reindeer is the only mammal that can see UV light.
17
If Antarctica's ice sheets melted, the worlds oceans would rise by 60 to 65 metres (200 - 210ft) - everywhere
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