Our Cells Are Filled With 'Junk DNA' -- Here's Why We Need It

Much of our genome has no apparent purpose. Is it so-called "junk DNA" or do we simply not understand it? (Credit: ktsdesign/Shutterstock) Would you purchase a book with over 98 percent of the text written in gibberish? Biology has no business in the book industry, yet it still writes a pretty fascinating guidebook: DNA. Our genetic manual holds the instructions for the proteins that make up and power our bodies. But less than 2 percent of our DNA actually codes for them. The rest -- 98.5