How would you go about answering the question “How many people have ever lived on this planet?” If you type that into Google ...

Here’s what you’ll learn when you read this story: While most estimates place the current human population at around 8.2 billion, a new study suggests we might be vastly underrepresenting rural areas.

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Here’s what you’ll learn when you read this story: While most estimates place the current human ...