The Wonders of DNA

The DNA in your body could stretch to Pluto and back, multiple times. Inside each of your

36 trillion cells is a 2-meter-long instruction manual called DNA. It’s a twisted ladder

made of just four letters: A, T, C, and G.

These letters form genes, which are the recipes for everything that makes you,

you. They determine your traits, like your eye color, whether you have

dimples, or if you can curl your tongue. And get this: tiny changes in that

massive code are the reason for all the diversity of life on Earth.