Hello?

Centuries ago there was only one way to say hello to someone - walk up to them, and say 'hello.' Since then, humans have come up with all kinds of ways to communicate with one another. How many can you figure out here? Look at the photos and read the clues in the PDF.

We want to hear, did we miss an angle we should have covered? Should we come back to this topic? Or just give us a rating for this story. We want to hear from you.

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