As soon as an actor in a movie or TV show starts rattling off a phone number, every viewer knows what the first three digits will be: 5-5-5. How did “555” become the convention for fake phone numbers, ...

The biggest number ever counted to by a human is one million. It took Jeremy Harper of Alabama 89 days.

When you move beyond trillions, there are some extremely mind-bending numbers, says Richard Fisher. Some of them are too large to fit in the mind – or even within the known Universe. What's the ...

Whenever you look at a clock, do you always see the same time? It might be 11:11 or 3:33. Maybe repeating numbers have made their way into other aspects of your life, such as a receipt that totaled ...