Curated OER
Wikipedia: Featured Image: Clock Tower, Palace of Westminster
The Clock Tower of the Palace of Westminster, now known as Elizabeth Tower but colloquially known as "Big Ben", in Westminster, London, England.
Curated OER
Extreme Science: Systems of Time: Atomic Time
Did you know that Atomic Time, "is the most accurate realization of a unit that mankind has yet achieved?" Learn about this and other systems of time and how they are used.