A single greeting card that plays Happy Birthday has more computer power than the Earth had in 1950!

According to Gordon Moore, the number of transistors that can be arranged to fit on a silicon chip doubles every 18 months. This means that the number of actions a computer is able to do also doubles every 18 months.

If you would like to think about it in practical terms, the number of operations it takes a common greeting card to play Happy Birthday is more than all technology on Earth was capable of in the 1950’s! While this is amazing, scientists believe that the limit of computational power will be reached in the year 2020 because it is physically impossible to reduce the sizes of transistors and further!

(Source)