No other geared mechanism of such complexity is known from the ancient world, or indeed until medieval cathedral clocks were built a millennium later.
Other types of atomic clocks being built today include those that use the rubidium, rather than cesium, as the reference for the oscillator.
He thinks that math is the only way we can understand the sheer complexity of what is happening neurotransmitters coming and going, protein clocks being built up and broken down, electricity bouncing around.
But they haven't lost a step since the clock was built in 1913.
Its central structure, the tower of which is graced with a golden-handed clock, was built in 1260 and is considered the best preserved Gothic town hall in all of Germany.
If last year's course, with nearly 60 miles of individual tests against the clock, was built for a time-trial specialist like Bradley Wiggins, who won the 2012 race, this year's course is suited more to all-around riders.
This is an example of the rare phenomenon known as dream incorporation, where something external, such as an alarm clock, is built into your dreams.
The dial of the Zytglogge's astronomical clock is built in the form of an astrolabe.
A sophisticated water-powered astronomical clock was built by Al-Jazari in 1206.
The first accurate caesium clock was built by Louis Essen in 1955 at the National Physical Laboratory in the UK.
The first quartz crystal oscillator was built by Walter G. Cady in 1921, and in 1927 the first quartz clock was built by Warren Marrison and J. W. Horton at Bell Telephone Laboratories in Canada.
