Golden Ratio

Golden ratio- Easy Explantion

http://www.i-sis.org.uk/The_Story_of_Phi-Part_1.php

Ancient Knowledge

 http://www.maa.org/press/periodicals/convergence/mathematics-as-the-science-of-patterns-introduction

Easy to explain pi

https://www.youtube.com/watch?v=JCTCG19_nWg

art and math

• The force of gravity, g = 9.8 m/s2
  Gravity accelerates you at 9.8 meters per second per second. After one second, you're falling 9.8 m/s. After two seconds, you're falling 19.6 m/s, and so on.