How do we know Earth is round?

Members of the Flat Earth Society claim to believe the Earth is flat despite scientists explaining how we know the Earth is ...
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Survey: A third of millennials aren't sure if the Earth is round

A new survey conducted by YouGov found only 66 percent of millennials (age 18-24) who were polled firmly believe the world is round. The rest of the millennials surveyed said they were either ...