○○○ Ptholemy ⪢⪢
The old
idea that the sun moved around the earth is known as the geocentric theory.
This
idea was first made famous by an ancient Greek scientist Ptolomy who lived in Egypt nearly 2000 years ago.
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• number
A number is a count or measurement. It is really an
idea in our minds.
○ count: the total determined by counting
○ measurement: the size, length or amount of something, as established by measuring
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