There are several groups. One,called the Counting Club, is for children who love working with numbers.

VOA: special.2010.12.28

So now we're just counting up our orbitals, an orbital is completely described by the 3 quantum numbers.

所以现在我们只要把这些轨道加起来，一个轨道是由３个量子数完全确定的。

麻省理工公开课 - 化学原理课程节选

The work, by Professor Brian Butterworth, has shown that dyscalculic children are troubled by even the simplest numerical tasks such as selecting the larger of two numbers or counting the number of objects in a display.

BBC: two dice

The parental emotion is as simple as a learning to count and as strange as discovering that the series of numbers, the counting, never ends.

BBC: A Point of View: The pain when children fly the nest

Unique visitors numbers are reached by counting each individual only once in each month.

FORBES: Google Hits One Billion Visitors in Only One Month