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Know your pulse day

We looked at how our heart worked as a pump by investigating other kinds of pumps.

We looked at how our heart worked as a pump by investigating other kinds of pumps. 1
We looked at how our heart worked as a pump by investigating other kinds of pumps. 2
We looked at how our heart worked as a pump by investigating other kinds of pumps. 3
We looked at how our heart worked as a pump by investigating other kinds of pumps. 4
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