Hidden inside a sea of 02s is the number 20 waiting to be spotted. It sounds like an easy job, but the vast majority of people fail to locate it in under six seconds. In fact, only 2% of people ...

When you count to 20, you start at 1 (or zero) and count on until you reach 20. Each number is one more than the last. When you count back from 20, you start at 20 and count back until you reach 1 ...