Fun Science Facts There is enough DNA in the average person’s body to stretch from the sun to Pluto and back — 17 times The average human body carries ten times more bacterial cells than human cells It takes light up to 40,000 years to travel from the core of the sun to its surface, but only 8 minutes to travel the rest of the way to Earth You can’t taste food without saliva Octopuses have three hearts, nine brains, and blue blood An individual blood cell takes about 60 seconds to make a complete circuit of the body