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Lifespan of Cells in the Body

Cells in the human body are constantly renewing themselves, replacing one another, with lifespans ranging from a few days to...

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Principles of Helicopter Operation

How Helicopters Work: How Do They Change Direction and Flight Path?Understanding Helicopter Operation PrinciplesMain RotorThe primary function of the main...

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Still Can Revive the Dead

A doctor has stated that a person can be revived several hours after they appear to be dead. This opens...

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