[real saxophonist]

There are two types of countries:

Those that use the metric system,

And those that have landed on the Moon.

[Bubba_Leroy]

There are two types of countries: Those that use the metric system, And those that have landed on the Moon.

Plus the countries that landed on the Moon did it using slide rules and "super-computers" with combined processing power of far less than your average smart phone.

[Getready]

Most scientific work is done in metric system, regardless of the commonly used measurements.