View full lesson: http://ed.ted.com/lessons/dna-the-boo...

Your body is made of cells -- but how does a single cell know to become part of your nose, instead of your toes? The answer is in your body's instruction book: DNA. Joe Hanson compares DNA to a detailed manual for building a person out of cells -- with 46 chapters (chromosomes) and hundreds of thousands of pages covering every part of you.

Lesson by Joe Hanson, animation by Nipun.Co Motion Craft.