British evolutionary psychologist Robin Dunbar has maintained for more than three decades that humans cannot maintain a social network beyond 150 people. This famous threshold—known as Dunbar’s Number ...

But there are friends and then there are really good friends. And for that, you only have about five people. Expand the ...

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

Do you know your mother's phone number by heart? Probably, right? How about the current number for your children, grandchildren, friends, loved ones and coworkers? It’s likely a memory test that many ...

A lthough no one won the $258 million Powerball jackpot in the latest drawing on Monday Oct. 13, many players in Ohio took ...