The International System of Units, abbreviated SI (for the French phrase Système International d'Unités), is the most widely used system of units. Along with the older cgs (centimetre, gram, second) system, SI is sometimes referred to as the metric system (especially in the United States, which has not widely adopted its use in everyday commerce, and the UK where conversion is incomplete).
The essential elements of the scientific method are traditionally described as follows:
Observe: Observe or read about a phenomenon.
Hypothesize: Wonder about your observations, and invent a hypothesis, a 'guess', which could explain the phenomenon or set of facts that you have observed.
Test
Predict: Use the logical consequences of your hypothesis to predict observations of new phenomena or results of new measurements.
5 October 2011
A date inscription for the Mayan Long Count
The International System of Units, abbreviated SI (for the French phrase Système International d'Unités), is the most widely used system of units. Along with the older cgs (centimetre, gram, second) system, SI is sometimes referred to as the metric system (especially in the United States, which has not widely adopted its use in everyday commerce, and the UK where conversion is incomplete).
Precession of the perihelion 
Galileo Galilei
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