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 ...

If you've got the time, we've got the riddle. And it's time for a riddle about time: How many numbers are on a clock? It begins with the simplest of questions that, nevertheless, has no simple answer.

In the early 1970s mathematician Donald Knuth spent a sabbatical with his wife in Norway. The time was meant to be spent relaxing. Yet one night he woke up his partner in a state of agitation. He ...

Do you ever seem to see repeating sequences of numbers over and over again, like 222 or 333? Or have you heard that seeing 11:11 on the clock is a lucky sign to make a wish? It definitely feels like a ...

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 ...