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Hipervinculo Física
Find out how a strontium clock keeps time, why it is extremely accurate, and why such accurate time keeping is important.
It is an educational content of CK-12 Foundation (to access some of the CK-12 c ...
Hipervinculo Biología
Covers standard scientific units of measurement.
It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).
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