What is the worlds most accurate/precise clock?

Question

What is the worlds most accurate/precise clock?

Answer 1

The atomic clocks (yes, clocks) in Colorado.  There are a series of them, and they'll neither gain nor lose a second in 57,000 years.

Answer 2

Mickey Mouse circa 1956.

Answer 3

it was the one on the atomic bomb

i wouldn't suggest you carry one of them to tell the time!