From The TED-Ed YouTube channel:
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 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.