I found this which might help in this quest of gaining understanding when those without knowlege ie the vast majority of people,ask us.
http://primaryimmune.org/wp-content/uploads/2013/06/YA_How_to_Explain_PI.pdf
When I get to meet Willie Nelson,I'll tell him this.
"Well Willie,do you remember that old story the Dead did a song about,Samson and Delilah.It was on Terrapin Station.Now there's different Delilas out there,Willie,some who just get straight in there with a no 1 razor and shear you quick and others like the Delila who got me who creep around while you are asleep and cut off just one lock at a time.The end result is just the same.
But they can help now.I have had your human globulin 80 times over 7 years which means I am as recovered as I'm going to be which is why I can get to talk with you now.So,let's celebrate.Pass it on!"
Samson and Delila!