Yeah.. wtf. I mean, ive used this in gardening (food grade, mixed into soil while wearing a dust-mask) to help cut down on pests (root maggots on some specific types of root vegies).  I have never heard about people actually eating this. It is an ultra-fine powder and seems like it would cause a lot of problems if you ate it in any quantity more than what might be left over on some well washed root veg.  Whats worse.. With the crap they are feeding the kid I thought they would be an anti-vax? Apparently they are just insane.