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Smiling indicates happiness. All cultures use smiles to indicate happiness.
world travel tshirt
For every given language(with more than one word) A you can invent a new language B as good as A by simply swapping the definitions of words
Eg English becomes E'nglish by swapping the word "dog" and "cat"
At some point the population of modern humans must have been small. If modern humans had any language during this time, it would likely have been universal.
There can be a Universal language but there will be different dialects and that is an arbitrary line to draw.
Because in old English "world" looked like*
In modern English it is worlds singular and worlds plural. So is that considered 2 languages or 1 with different dialects.
Emojis can be example for a universal language.
It is widely believed that around 3500 BC there was a single language spoken by the ancestors of all modern Indian and European populations, called the Proto-Indo-European language. This is the closest thing to a universal language that ever existed.