Why we should colonize the moon

< Colonization of other planets
 * Wikipedia: https://en.wikipedia.org/wiki/Colonization_of_the_Moon

Introduction

 * According to Elon Musk we should colonize other planets, to prevent humans from extinction.

To-do

 * Read https://www.nasa.gov/exploration/home/why_moon.html
 * NASA asked 1000 experts why we should colonize the moon.