Science
How the natural world actually works.
A single blood cell completes a full circuit of the body in about a minute. Driven by the heart, a red blood cell travels out through the body and back roughly once every 60 seconds.
Stretched end to end, the DNA in your body would reach far beyond the solar system. Uncoiled and joined together, the DNA in a person's cells is often estimated to span the distance from the Sun to Pluto and back many times over.