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A shard of smooth bone etched with irregular marks dating back 20,000 years puzzled archaeologists until they noticed something unique—the etchings, lines like tally marks, may have represented prime ...

Image made with elements from Canva. Let’s go back to grade school—do you remember learning about prime numbers? They’re numbers that can only be divided by themselves and one. So 2, 3, 5, 7, 11, and ...