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“If uncoiled, the DNA in all the cells in your body would stretch 10 billion miles, from here to Pluto and back.” 
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DNA is like tiny coils of spaghetti, smaller that can be seen by the human eye, inside every cell in our body. These are the instructions for building the human body. There are approximately 10 trillion cells in your body, so when we put all the tiny DNA strands end to end they stretch really really far!
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If you unravelled all of your DNA from all of your cells and laid out the DNA end to end, the strand would stretch from the Earth to the Sun hundreds of times (the sun is approximately 98 million miles away from Earth).

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There are approximately 3 billion (3,000,000,000) chemical letters (otherwise known as bases) in the DNA code in every cell in your body.

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Nerve impulses to and from the brain travel as fast as 170 miles per hour. Ever wonder how you can react so fast to things around you or why that stubbed toe hurts right away? It's due to the ... rest of your body and vice versa, bringing reactions at the speed of a high powered luxury sports car.

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